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February 23 2012
Make: Talk 006 – William Gurstelle, Backyard Ballistics
Here’s the 6th episode of MAKE‘s podcast, Make: Talk! In each episode, I’ll interview one of the makers featured in the magazine.
Our maker this week is William Gurstelle. He’s a contributing editor to MAKE and his books include Backyard Ballistics, Adventures from the Technology Underground, and Absinthe and Flamethrowers. In addition, Bill writes frequently on culture and technology for national magazines and blogs including The Atlantic, Wired, and Popular Science.
Here’s are some projects William has done for MAKE:
Two-Can Stirling Engine
Bullwhip
Double Pendulum

Super Tritone Shop Whistle
Doing it right with a morse code keyboard

Hackaday has seen dozens of Morse code keyboards over the years, but [Hudson] at NYC Resistor finally managed to give that idea the justice it deserves. He built a USB Morse code keyboard with the same type of telegraph key the pros use.
For his project, [Hudson] got his hands on a wonderful iambic paddle that is usually hooked up to CW rigs. Unlike previous Morse keyboards we’ve seen, [Hudson] used iambic paddles, a telegraph key with one lever for dits and another for dahs. Because the dits and dahs are separate electrical connections, it’s extremely easy for the microcontroller – a Teensy - to parse the Morse code and send the correct letter to the computer.
[Hudson] also added some audio feedback for the dits and dahs, and designed a laser-cut enclosure for the Teensy and speaker. Check out the video of the iambic keyer keyboard in action after the break.
Filed under: peripherals hacks
What is a Hacker? Ask One.
I love this pair of “interviews” that hacker legends Mitch Altman and Emmanuel Goldstein gave to the Media Show.
When someone says they are a hacker, what do they mean? Are they just big computer geeks? Are they doing illegal criminal things, breaking in and stealing passwords? Mitch Altman, inventor of the TV-B-Gone, tells us hacking is about thinking differently about the world around you. Featuring the folks at the Noisebridge hackerspace in San Francisco, who show off their projects with bikes, toys, clothes, food, electricity, and even outer space!
BTW, it looks like the Media Show could use a little support to stay running. [via Drew Fustini]
How-To: Build and Use an Afghan Box Camera

My old pal, Bay Area shutterbug Billy Baque, has a passion for the handmade, low-tech, all-in-one cameras-plus-darkrooms used by street photographers around the world. The so-called Cuban Polaroid is a typical example—a wooden box with a light-tight sleeve for the photographer’s arm at one end and a lens on the other. Billy describes the typical use:
Using photographic printing paper the photographer would expose a sheet of paper for the negative, develop, stop, and fix it inside the camera, then put a copy stand on the camera and photograph the negative (to obtain a positive), develop, stop, and fix, then wash the final print in a coffee can of water attached to his homemade tripod.
Billy just hipped me to Lukas Birk’s Afghan Box Camera Project, an ethnographic study documenting the rapidly-vanishing traditions, technologies, and skills of street photographers in Kabul. The Afghan version of the Cuban Polaroid is known as the kamra-e-faoree, and Mr. Birk has gone to considerable lengths to document its traditional construction and use, preparing a detailed build guide and an on-site video minutely recording lifelong Kabuli street photographer Qalam Nabi, in action, with his. [Thanks, Billy!]
Electronic bag pipes need no bag and use only 1 pipe

A lot of people might turn their noses up at an electronic version of bagpipes. But we see a definite need for them. After all, it’s pretty hard to take your bagpipes on a road trip, but this eChanter will have no trouble entertaining your fellow travelers.
The musical instrument is Arduino-based and the builder can decide between a headphone jack (use it with that FM transmitter when in the car!) or a speaker. The version seen above uses headphones with a piece of PVC pipe as the body, screw heads as touch sensors, and a project box to hold the electronics. But there are a lot of alternatives suggested, such as using automatic sprinkler parts. It sounds like a riser, connector, and pop-up sprinkler head body will do just as well hosting all of the components.
Want to hear what it sounds like? There’s an mp3 clip under the final steps section.
Filed under: musical hacks
WWII Air Raid Siren Speaker Conversion
Listen to your iPhone loud and clear with this vintage WWII era air raid siren conversion. Austin’s Chase and Scout preserved the speaker’s industrial vibe while updating it for modern playback. You can connect pretty much anything with a standard 1/8″ headphone jack to the recessed amplifier and 6″ powered speaker for a unique listening experience.
How to Clean a Man Cave
Although you may want to ignore the man cave or just use a blow torch because you know it’s a big (and potentially nasty) job, eventually it must be attacked. Lace up your biohazard suit and grab every bottle, can or gallon of sanitizer and attack. Oh and yeah, you might like to grab the creator of the man cave too and dispense some cleaning-your-own-den lessons at the same time.
Edit Steps
- Get permission. Now this step is highly personal to the man in question. You'll know whether you already have permission to cross the threshold of the man cave and begin cleaning, or whether you need to seek it. If you need to seek it, be assertive and have a factual list of why the man cave needs cleaning. Top of this list should be family/household health and sanitary well-being, ridding the place of vermin hotspots, having a pleasant place to invite man friends back to and the fact that you'll go on strike cleaning anything else if the man cave stays filthy.
- Some of you may be thinking, "There is no way I am responsible for cleaning this man's man cave. He should do it himself, just as he is expected to do his share in the house." Good for you, you've got it all sorted and just need to pass on your secret formula to every other woman seeking shared shouldering of the household cleaning.
- Focus first on what you know to be junk. Finding items that must be thrown away isn’t for the man cave cleaning novice; it requires the acumen and intelligence of an experienced man cave ninja because it isn't just what's obviously strewn about––it's also about unearthing the hidden junk. And while there is probably some fine line you're never going to grasp between a collectible beer can and a beer can destined for recycling (do you really care about any such distinction anyway), there are plenty of items you'll know instantly as junk, such as an empty chip package or half drunk beer bottles. Focus first on what is clearly garbage and shift it on out and have a tough love approach to so-called collectibles that need recycling, not displaying.
- Be shrewd and savvy when hunting for junk. Half eaten bags of chips easily sidle their way into intricate crevices of sofas, chairs and behind every piece of furniture. Beer bottles roll under things and cans are crushed (in demonstrations of man strength) and tossed every which way.
- Dig right in between couch cushions. Prepare yourself for what you may find between and underneath couch or chair cushions because it may get ugly. Carefully peel back each cushion and remove the food, candy, newspaper or coin stash hidden beneath. Consider unzipping each cushion as well––sometimes even men run out of hiding places for their wrappers and cans and may end up stuffing them inside the cushion itself.
- Check underneath just about anything that can be moved, shoved aside or peeled aside. Every piece of furniture in the man cave is fair game for trash hide n' seek and possibilities for stuffing junk run deep. Don’t just look underneath the perimeter of the furniture; be sure to look all the way to the back, especially if it butts up against a wall.
- Look up. Junk may be hidden in odd places such as on top of high entertainment centers or even lamps. If you think like one of the guys, consider what you’d do with your bag of cookies after they’ve been eaten, but you really don’t want to get up and have to throw it away in the trash can. And if you're really unfortunate, there may even be something splattered on the ceiling from a manly competition to see who could throw highest (let's just hope for your man's sake that it hasn't involved your cooking).
- Deodorize. There’s a pretty good chance that your man has been sitting on his man cave couch after rolling around in the yard with the dog and it only gets worse when socks worn for days in a row are found stuffed into the sofa edges. To restore the odor-friendly equilibrium, your next line of defense is to deodorize and sanitize the place, as follows:
- Couches and chairs. If you had the foresight to put slip covers on all the upholstered items, take them off and wash them using the “sanitary” setting on your washing machine. However, if you are dealing with straight up upholstery, you can attack the situation a few ways. Rent or hire a steam cleaning company to sanitize upholstery or you could drown everything in Febreeze (or another fabric deodorizing spray).
- Bleach and/or disinfect surfaces. The best way to murder germs is to go hard core and use bleach. Obviously, make sure bleach won’t damage the surface or you'll never hear the end of how you ruined the car trunk sale find of the century. For those areas that are tiled or have a non porous surfaces, bleach is probably fine; however, the only way to tell is to test the compound on a small, inconspicuous area. If you can’t use bleach, look for a disinfecting type agent instead. Even a wash down with vinegar and water will restore the healthy atmosphere.
- Air. Spray disinfectant in the air, between couch cushions, underneath furniture and inside trash cans to release odor and germs from the area.
- Locate all used bowls, cups and plates. If you have noticed that some of the dishes are missing from their usual kitchen station, most likely you can locate them in the man cave. Look for cups, glasses, dishes, bowls and utensils in the same places where you found wrappers and beer bottles. Also, consider checking window sills or countertops. You might also find platters, salsa bowls and nacho dishes in the man cave. Be prepared for nasty residues on some items.
- Pick up ancillary items. From dirty clothes to pieces of unopened mail, gather all items that may have found a new home in the man cave and make a pile. Consider creating your pile on top of a cleaned countertop or, if you’ve already deodorized the couch make your pile on a couch cushion. The idea is to clear the room of items that normally don’t belong in the man cave so you can finish cleaning.
- Use an empty laundry basket to gather your bounty. An efficient way to gather the most items at once is to find a large basket or even a garbage bag to load up. Don’t worry about what you are picking up (as long as it’s not an empty chip bag or soda can––those go right into the trash), just gather and remove.
- Make a pile using a rake. If there appears to be a tremendous amount of “stuff” strewn across the floor, use a clean rake to make a pile and then place everything into basket or bag.
- Organize, dust and vacuum. Dig into your pile of “stuff” and begin to organize. Make smaller piles such as a pile for mail, magazines, clothing etc. If something simply needs to be put back on a shelf or returned to its original home in the man cave and continue to organize.
- Transport all piles back to the intended area. For example, if you have finally located the cable bill (amongst other pieces of mail), bring it to your desk or wherever you pay bills so it’s ready to be paid. Take dirty clothing to the laundry room, etc.
- Re-examine the room for errant scraps or items left behind. If you have a big job to do, it’s easy to overlook items so go back and give the room a once (or twice over) to ensure you’ve found everything.
- Using wood or another cleaner, remove dust from all surfaces. You may also need glass and other types of cleaners depending upon the furniture in the man cave.
- If your man cave has carpet, sprinkle the area with baking soda and/or deodorizing carpet freshener. Wait a few minutes to allow the solution to soak into the carpet and then vacuum.
- If the man cave has tile or wood flooring, sweep, Swiffer (using a duster) and then wash the floor using the recommended floor cleaner.
- Liberate yourself from cleaning the man cave. This step should really be the first step because you need to bring the man with you as you're cleaning. Because in reality, this needs to be a training session, in which you demonstrate what he will be doing from now on. His space, his responsibility. And the embarrassment may just be enough that you'll never have to step foot in there to clean again. And if you're really lucky, he might apologize by showing a special movie for the two of you in his man cave. Lucky you.
Edit Tips
- Consider renting a carpet cleaner to remove the grime and any dirt hidden inside the carpet.
- Keep in mind that despite your rigorous efforts, the man cave may return to its previous state within a matter of days (or even hours). You need to be okay with this and know that you may have at least prevented a few health hazards with your work.
- Add a few air fresheners to the room such as a plug ins or perfume oil soaked wooden reeds.
Edit Warnings
- Before tossing everything in the room, ask your man to remove any valuables that could be misconstrued as junk.
- Not everyone will experience the grotty man grotto. Some man cave owners are are very tidy and clean. If you experience this instead, this article isn't applicable, obviously.
Edit Things You'll Need
- Cleaning gear
- Trash bags
Edit Related wikiHows
Intern’s Corner: MAKE Firetruck
So if you didn’t know, here at MAKE, we have an old Mercedes Firetruck (it’s actually a hose/ladder truck) that built in Germany during the 1970s. Some of you may have seen the truck in the past, at various events, but for a long time, the firetruck has just been sitting around, in dire need of maintenance. There were several issues we had to overcome to get the truck running again. For one, it would not start and the wiring was pretty bad, so nothing worked properly. We were able to get it working for the Oakland Mini Maker Faire last year and hope to bring it out for more events in the future.
The first thing we did was to get the truck running, which was an interesting task because of the condition everything was in. We checked all the basic things, such as the starter, made sure power was going where it’s supposed to be go, the fuses and the contactor were still intact (which on this truck is used during starting, since the truck starts at 24 volts). After some further testing and bypassing, we determined the reason it was not starting was that one of the two 12 volt batteries had a bad post and would not allow enough current to flow. After replacing the battery, it starts up every time without any issues.
The next thing we did was to get all the lights working. This included the emergency lights, brake lights, reverse lights, fog lights, dash lights, and the lights that are inside the truck. Most of the issues with lighting were due to old fuses which we are slowly replacing with blade fuses. At first, we thought all the emergency lights were broken, but it turned out that the siren had to be switched on to power the emergency light circuit. (The siren is really loud as you can hear in the video). We bypassed the siren circuit, and now, all the emergency lights work even when the siren is not running.
We are still restoring it back to proper working condition and will soon be adding some awesome mods!
Written by MAKE Engineering Intern Brain Melani
[Photos by Gregory Hayes]
How to Tackle Freelance Time Wasters
To be effective and to maintain an excellent reputation, it is important for you as a freelancer to manage your time efficiently, in order to get the most benefit out of time and to produce the best you can.
Edit Steps
- Decide what service you want to provide on a freelance basis. The more specific, the better. One possible time wasting element of trying to be too broad in your freelance skills is that you'll try to be a jack of all trades and a master of none, never quite producing high quality work in anything because you're dabbling across everything in your field. Resist this temptation and hone down the freelancing to what you're absolutely best at. You can always sub-contract for areas in which you have weaknesses rather than slowing down your response time and not giving the best service.
- Go through your skills list. Ascertain from the start where you're strengths and weaknesses are and map out how to deal with weaknesses, such as getting help, not accepting assignments based on your weaknesses, or working with someone else who has strengths where you don't, on a permanent or semi-permanent basis.
- Ensure you have the equipment necessary to do the job before accepting any new assignments. Lacking the right equipment can slow you down considerably because you'll be attempting to make-do or having to chase across town to find the one place that can do the service for you. Although the initial outlay on equipment might be pricey, in the long run you will save money because everything you need to produce professional outcomes will be at your fingertips and under your own control.
- Don't be afraid to call in mobile technical assistance when equipment breaks down on you. The cost of doing this will be far outweighed by having equipment in good working order, fast.
- Buy quality equipment at the outset so that it doesn't break down and let you down. If the costs are prohibitive, see if it's possible to make a highly accessible arrangement to share equipment with others in your freelance field who are close by. Make sure that these arrangements are with reliable people who will be happy to see you at 3am in the morning to use the equipment on the odd occasion.
- Advertise your services. Be very specific about what service you are actually offering to your potential clients. This will cut down on time spent answering calls and emails from people who need something you can not, or will not do. Use a website to add more details that cannot be included in the advertisements, making it clear in the ad that more information is available there.
- If you use an outsourced call center to handle calls about your freelancing, make sure that they have all the necessary facts before them. You don't want to put off customers by having someone else's lack of knowledge undermine your business.
- Do not take on more work than you can handle. Too much work will cause you to feel overwhelmed and you'll soon fall behind. Making excuses to clients about things over which you have total control never looks good. Start out slowly until you learn how much work you can realistically complete on your own, taking into consideration the size of your budget, and your team. It is better to make little at first than to get a reputation for being unable to meet what you've promised to do.
- When agreeing to do any type of work that you intend to be paid for, be prepared to issue an invoice, work order, or contract that you and your customer can sign. This document should clearly describe exactly the work that you promise to do, and whatever terms for compensation you agree to. This can save an enormous amount of time in the event a disagreement arises regarding the work that should be performed, or the amount of money to be paid by your customer. A binding written agreement can save extensive time and costs in court should a legal dispute arise. This document can be as simple or as complex as your particular discipline requires.
- Designate a time and place to do the work that is free from distractions. Although freelancing may offer more freedom than traditional full time employment, it is incredibly important to practice self discipline. If you have constant distractions, you'll be interrupted and lose your flow of thought and action. If you have a noisy workspace treated as a thoroughfare by everyone else, it becomes hard to take your freelancing seriously. Your workspace should be free of excessive noise, unnecessary electronic devices, children that require your care while you are working, etc.
- Freelancers working from home often feel guilty about housework and meals. It is important to clarify with all other household members that your work day is as real as anybody else's and that you're not available to do chores and meals on demand. Don't feel guilty if you need to hire a cleaner even though you're constantly at home; having it done is far better than having it weigh heavily on your mind and it frees you up to get more freelancing done.
- Keep a log of the hours spent working on freelance assignments. Note which tasks are taking more time than others. Look for ways to streamline your work flow. Research tools and techniques that may speed your progress.
- If you find some things are taking a lot more time than you originally envisaged, consider whether a change in approach will be adequate or whether it is something you are always going to find a bit of a battle. Administrative tasks can easily become time-wasters that could be better done by someone else, such as students after school, online call centers, or a bored homebody looking for a few hours work a week.
- If you feel that your client is demanding too much in the way of additional workloads, be honest about what is and is not possible in your current schedule. By saying yes to everything even though you're swamped, you set unreasonable expectations that you're able to cope.
- Expect to make mistakes. Do not let these mistakes discourage you, or cause you to quit. Be determined not to repeat the mistakes that prove costly and time consuming. In time you will increase your speed and effectiveness as a freelancer. And eventually, you will be in a great position to pass on this knowledge to others working freelance.
Edit Tips
- Time wasters can come in all sorts of different forms if you're not alert. If you start finding yourself making excuses to do things that are peripheral to your freelancing by stating that they "help" in some vague way, be wary of the time these extra things are chewing up; from using apps to attending seminars, everything that you claim as useful for freelancing really must be, or don't use it as an excuse but treat it as the break, hobby or entertainment that it really is.
- Listen to your body and feelings. Sometimes you may be truly determined to work on certain things but it turns out that they're not as interesting, straightforward or ideal as you originally thought. There is a fine line between not giving up and doing yourself damage by trying to do work that isn't your forte and never will be. Body pain such as constant neck aches and back pain and feelings of despair, anger and frustration are warning signs that what you're doing isn't working.
Edit Warnings
- Freelancing isn't for everyone. The relentless pace and the feeling that things are never quite ended can drag you down after the initial flush of enthusiasm wears off. If you've given it a good go but find that after a year or two that it's still really hard work and you find it very difficult to discipline yourself, you may be better off returning to salaried work. At least you gave it a try and you won't have regrets for doing so.
Edit Related wikiHows
Rock Out Hands Free with Air Guitar Hero
Biomechanical engineer Robert Armiger and surgical roboticist Carol Reiley, both of Johns Hopkins University, created Air Guitar Hero as a fun rehabilitation exercise for people with amputations. The original version they made was a bit costly, but they wrote up a less expensive DIY version, and shared their build instructions with us on the pages of MAKE Volume 29. Now we’ve shared the full how-to on Make: Projects. Whether you intend to build your own or use the concepts to build something entirely different, the info is freely available for you to play with.
How does it work?
When a muscle contracts or flexes, it produces electrical activity. While faint (in the millivolt range), these signals can be detected by placing electrode sensors on the skin. The technology to measure, evaluate, and process muscular electricity is called electromyography (EMG). Air Guitar Hero uses EMG to send signals to the Wii console to control the game. But since the electrical signal generated by twiddling your fingers is very weak, additional computation must be performed to generate reliably accurate commands. The system uses pattern recognition algorithms to identify patterns in the EMG signals and decide which colored button to activate. The algorithms require training data to provide examples of what signal characteristics to look for. First, you must correctly play on-screen notes with the guitar while the electrodes record your EMG signals. Next, the recorded data is used to train a model for recognition the next time you make those movement patterns. Third, practice makes perfect! Playing this type of video game can be useful for building muscle tone and dexterity.
You play air guitar, moving your (A) 4 fingers corresponding to the first 4 “note” buttons on the Guitar Hero controller. (B) Electrodes on your arm detect tiny electrical signals from the muscles that move your fingers. These (C) EMG signals are boosted by (D) amplifiers, each on their own channel. The amplified signals are gathered by the (E) data acquisition board, which sends them on to the (F) laptop computer. The (G) USB video capture device pulls the Guitar Hero video from the (H) Wii video game console into the computer, for purposes of training the software. The (I) Air Guitar Hero software interprets the mixture of EMG signals as one of the 4 button-pressing motions, then sends the corresponding button command over to the (J) hacked GH controller which relays it to the Wii. It sends the Strum command automatically when you hit the note. You’re rocking out!
Here’s a video of Iraq war veteran amputee and Open Prosthetics Project founder Jon Kuniholm demoing the Air Guitar Hero:
From the pages of MAKE Volume 29:
We have the technology (to quote The Six Million Dollar Man), but commercial tools for exploring, assisting, and augmenting our bodies really can approach a price tag of $6 million. Medical and assistive tech manufacturers must pay not just for R&D, but for expensive clinical trials, regulatory compliance, and liability — and doesn’t help with low pricing that these devices are typically paid for through insurance, rather than purchased directly. But many gadgets that restore people’s abilities or enable new “superpowers” are surprisingly easy to make, and for tiny fractions of the costs of off-the-shelf equivalents. MAKE Volume 29, the “DIY Superhuman” issue, explains how.
DIY or Buy: Custom-Fit Earbuds

My inbox is peppered with emails from PR firms offering samples of new products for review, a situation common to us bloggy folk, I suppose. Rarely are the items in question relevant to our beloved practice of making, but once in a while, I’m presented with the prospect of checking out a shiny new commercial version of a device I’ve previously crafted/made/hacked-together myself.
Most recently, an offer to demo a set of custom-fit earbuds caught my eye, and instead of hitting the delete key as usual, I thought it might be interesting to compare these to my own DIY mod/hack which aimed to produce the same functionality. Comparing a commercial product to one you made yourself may not be a fair or straightforward process, but it addresses a question I ask myself quite a bit these days: “DIY or Buy?”
The Buy:

The Sculpted Eers PCS-100 Custom-Molded Earphones product consists of a surprisingly large-fitting headset temporarily attached to a pair of in-ear earbuds. Each “bud” is surrounded by a rubber bladder ready to be filled with silicone compound via the fitting headset.
The DIY:

Making your own custom-fit earbuds can be done a number of different ways, but I’ll be using the ones I made here for this comparison. I used an old pair of Shure E2C in-ear earbuds for the basis of my version, along with a 2-part silicone from Radians.
Price vs Process: The Eers PCS-100 retail for $199 – not cheap, but also not surprising when you consider what’s included. The fitting process was quick & easy, but also quite wasteful as I’m now left with a relatively large plastic headset to dispose of – ick. On the other hand, the DIY version requires the insertion of silicone compound directly into the ear canal (with no retaining bladder) – a process which is understandably unappealing to some folks. The remaining process of drilling out the sound hole can be a bit fiddly if you aren’t experienced with using a Dremel (but if you’re reading this, you probably are, right?)

yours truly, intently focused on getting a good fit
Functionality: The resulting fit of the fitted Eers custom-fit fittiness is well – a nice comfy fit. They’re slightly more difficult to insert than my DIY pair, but they’re also much easier to wear in public without attracting undue attention (still regretting my choice of blue silicone for the DIY).

Sound isolation seems equal between both pairs, though noisy city living always leaves me wanting more of it. Sound quality is a much different story. The Eers PCS-100 feature “enhanced bass response,” a feature I kind of loathe in audio devices. The E2Cs used in my DIY pair have a much more even frequency response and therefore sound dramatically cleaner, less boomy, and more suited to my use as in-ear “monitors.” I’m fairly certain the Eers were delivering some nice treble, but it was hard to judge accurately with all the extra low-end mucking about. I’m aware that some humans prefer buds that go *boom* … just not mine you see. I did enjoy listen to some music with the Eers, but given the choice, I much prefer the sound of DIY.

Prolonged usage of the Eers resulted in very little physical discomfort, likely because of the small amount of material which comes in contact with the ear. As you can see, my DIY pair is decidedly less elegant in this regard, more or less a big gobby cement job which after very long periods of use, tends to hurt my outer earfolds(?) a bit. So there’s that issue to consider.
Verdict: As mentioned earlier, this is not exactly a fair comparison, mainly because whatever earbuds you decide to use in a homebrew iteration will obviously effect the resulting sound quality in a big way. That being said, I prefer my DIY pair. They’re less compact, less attractive, and less comfortable for long sessions, but the ability to reuse my old favorite earbuds, save ~$100, and avoid throwing out an elaborate fitting device goes a long way in my book.
(It’s worth noting that Sonomax sells a another version of the Eers which features a balanced frequency response, but the higher asking price of $299 would likely negate any audio improvement in respect to this comparison.)
February 22 2012
Learn how to play Survivor, a variation of the drinking game flip cup, in this drinking games video from Howcast.
Author: DrinkingGamesWithDrew
Things to Do on WonderHowTo (02/22 - 02/28)
WonderHowTo is made up of niche communities called Worlds. If you've yet to join one (or create your own), get a taste below of what's going on in the community. Check in every Wednesday for a roundup of new activities and projects.
Thanks to all of our active moderators and contributors from this past week: Christopher Voute, Jomar Fernandez, Ben Cusick, Cerek Tunca, Rex Gordon, Leinad 0716, and Ryan Glasspiegel.
As always, we would like to remind lurkers on site: WonderHowTo is a community effort, and the site belongs to all of you. The more knowledge we can pool together, the more we can learn from each other. With that said, join in. Write a tutorial. Post to a World. We are a curious bunch, and we want to see what you've got to share!
Below, this week's highlights: A crazy new weekly photo challenge, tips for disguising yourself, a 'flamethrower' BB machine gun, an elaborate static electricity shocking prank, and more.
Challenges and Workshops
- WTFoto Weekly Challenge — WTFoto is a new World devoted to hilarious photos and web meme sensations. Run by admin James Carr (who could just be a meme himself), there will be weekly photo challenges every Tuesday, with a simple infographic explaining all the gory details. This week marks his first challenge—finding the craziest, most absurd stock photo out there that everybody's never seen. Post your submissions to the WTFoto community corkboard by Monday, February 27th, 11:59pm PST for you chance to win... bragging rights. More details here.

- Minecraft World's Weekly Workshop — Join our official Minecraft server this weekend for a step-by-step tutorial with Kendra and the rest of the community on building a piston-activated movie theater. If you already know how, then come help everyone else out on the server. Make sure you're there on Saturday, February 25th at 2 PM (PST) / 5 PM (EST). More details here. If you still haven't joined the server, see how to get whitelisted.
- Minecraft World's Weekly Challenge — If you can't make the workshop, at least participate in the weekly server challenge! This week's theme gives you a little freedom of choice. You're presented with three packages containing a variety of blocks. Pick one and see what you can build using only the package's contents. Post your creation (could be anything) to Minecraft World's community corkboard for a chance to snag some server perks. More info here.

- Astronomical Observing News — Stay current on what's going on in the skies above with Cerek Tunca's weekly Astronomy World feature, AON. This week, make sure to catch Garradd before it's too late. And check out all of the conjunctions. Click here for a full rundown of the stargazing events for February 21st through February 27th. And join the World to share your astrophilic knowledge.

- Community Byte — This week, Null Byte will not be holding any community coding sessions. Longtime admin Alex Long has stepped down to focus on his studies. But don't worry—newbie admin Allen Freeman is getting a firm grasp on everything and hopes to bring back the weekly projects ASAP. Stay tuned on Monday for what's in store for the following Friday's workshop.

- Weekend Homework — Just because Null Byte has a new admin, doesn't mean you're free from your weekly homework assignments. Hackers around the world need your help! Continue checking in every Friday for the Weekend Homework. This week's topics include things like how interrogations work, making flashlights with dead computer batteries, batch image conversion in Python, and more. Share your knowledge! Simply message Null Byte admin Allen Freeman or post your article directly to Null Byte's community corkboard.

How-To Projects
- Want to step outside without someone you know noticing you? Or are you looking to escape those dreaded paparazzi? Yumi of Secret Tips from the Yumiverse has the info you need for effectively disguising yourself and staying low-key. Click to enlarge, or click through to view.

- Next time you find yourself stranded in the middle of the woods with no water, you can relax, because you know these easy tips for securing drinking water from the wild. It's amazing what you can do with a little plastic. Click to enlarge, or click through to view.

- Haven't been keeping up with Christopher Voute in the Fear of Lightning World? You should be! This past week, he continued his electromagnetic weapon series with a post on building basic flashlamp lasers. He also shocked us (literally) with a clever how-to on making your own static electricity and zapping people with just the touch of a finger.

- Ben of NightHawkInLight returns with an ingenious followup to his soda bottle BB machine gun. In this article, he gives us a nice mod that can turn that plastic BB gun into an airsoft driven "flamethrower", complete with backpack tank and all. Also, he offers an even cheaper version of the original gun, involving just a bottle and brake line. Click through to see them in action. Join his World to keep updated on future projects.

- Missed last Saturday's Minecraft Workshop on building redstone elevators? Don't fret. Kendra posted a detailed followup on how to build a redstone-activated elevator, so those that weren't involved can still reach the skies (if you dare build one that tall). Contact admin Kendra if you're interested in co-instructing a future workshop or taking on a topic of your own.
- Even though Alex Long relinquished his admin rights of Null Byte, he still pushed out a ton of helpful articles, which included knowing your rights for unlawful police stops, making homemade pepper spray, revealing the secrets behind brainwashing, and more. Check out the blog roll for a full rundown.

- Allen may be a newbie to the Null Byte world, but he's already written two very helpful articles on using the GNU Privacy Guard for encrypting and decrypting files and messages with 4096-bit encryption and then sharing those files with your friends. Make sure to keep an eye on the blog roll to see what Allen (and the mods) comes up with next.

- Need a little help multiplying numbers by 11? Jomar Fernandez, a newcomer to WonderHowTo, schooled us a neat trick to multiplying 2- and 3-digit numbers by 11 without a calculator. No longer will that first double-digit palindrome number be the culprit of a failed math test.

- Need a ticket to the next big game, but they're all sold out? Ryan Glasspiegel of Sports Rapport gives us the lowdown on scalping the scalpers and coming out on top. Next time you need a ticket for a sold-out sporting event or concert, consider these five steps to success.

I Made It
- As always, the folks in our Minecraft server have been diligently working on their builds. There are way too many projects to show off, but we'll showcase a few posted over the last week to Minecraft World's community corkboard below. Want to get in on the action? Join the server. Also, don't forget to start building your freestyle creations for the Minecraft challenge this week.
Got Something to Share?
If you've got a relevant How-To, a source of inspiration, or a finished project, post it to the corkboard in one of the applicable Worlds above. If your project is unrelated to these areas, you can publish a How-To article directly on WonderHowTo, or you can start your own World if you've got the passion—or just post directly to the WonderHowTo company corkboard.
Got a question? Comment below or email jmeyers@wonderhowto.com.
Photos by Colby, planetcalypsoforum, Getty Images, Dreamstime, 123RF, NASA, molin, gothamist, pureluminessence, cchrint, chamberofwizdom
Via Things to Do on WonderHowTo (02/22 - 02/28) on blog.wonderhowto.com.
Related:
Backyard ski lift

If you own a cabin in the mountains of British Columbia what do you do during the warmer summer months? Well, we’d probably mix of a cocktail and string up a hammock, but [Darrin] is quite a bit more motivated. He planned for the snowy season by building his own ski lift. He shared the details in a forum post, but you’re going to have to register and wait for approval before you can view that thread. Perhaps you’ll want to look at the video after the break before making that kind of commitment. Normally we would just pass over projects that require a login to view, but this one deserves the attention.
The setup is essentially a very steep tow rope. 1600 feet of 1/8″ aircraft cable covers an 800 foot span of his property. Apparently he’s got a total of 1000 feet of vertical drop but the lift doesn’t cover the whole area quite yet. That 6.5 horsepower Honda engine drives the cable loop, with the pulley system seen above used as an RPM reducer. Each skier can hook onto the cable used the nylon rope with a ski-pole spacer and a hook. The RC vehicle remote control works as a dead man’s switch, starting the lift slowly when the throttle is depressed and stopping it when released.
Normally we like to link to similar projects, but so far this is the only ski lift we’ve covered. You’ll have to settle for this ski-pole mounted POV display.
Filed under: transportation hacks
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