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How To: Make a Powerful PVC Air Cannon with Coaxial Piston Valve

The video featured in this article demonstrates the function and design of a powerful form of air cannon that operates using a purpose made valve that opens very rapidly. This allows for a massive amount of pressurized air to be released at once to throw a projectile many hundreds of yards. The design of the cannon also allows the barrel and the air chamber to occupy the same space, and so it is very compact and manageable which makes for an enjoyable shooting experience.

How To: Turn a Game Boy Advance into an Old-School Miniature Arcade Cabinet

No matter how advanced technology gets, there will always be room for classic video games in the hearts of nerds everywhere. Mini arcades became very popular, as they allowed users to take arcade games on the go. As Game Boys and other mobile gaming devices appeared, the mini arcade slowly disappeared. Well, believe it or not you can combine the best of both worlds! Metku user Japala wanted to make his old Game Boy Advance SP "look cool again," so he turned it into a mini arcade cabinet.

How To: Create a Light Painting Vortex Using a DIY Reusable Steel Wool Cage

There's no shortage of uses for steel wool, but the majority of them tend to be on the pyromaniacal side, like DIY fireworks. This trick by Mike Mikkelson is no different—it uses a homemade reusable "wool cage" to create a spinning vortex of light, like in the photo below. You can do this with just a piece of steel wool on a cable, but Michael wanted something he could easily reuse no matter how many shots he took, so he built a small cage to house the steel wool out of chicken wire, a small ...

How To: Make a Totally Geeky LED Pocket Watch That Tells Time in Colors

The cell phone may have replaced the pocket watch, but thanks to some clever mods and hacks, "old-fashioned" time telling is making a comeback. Smart watches that connect to your mobile device cannot only tell you what time it is, but also change the song you're listening to and let you know how many Facebook notifications are waiting for you. Frank Zhao, an electrical engineering student at the University of Waterloo, decided to do something a little different with his LED pocket watch. It h...

News: Apple Maps Parodies Get the Big-Screen Treatment; Batman, Katniss, and Jack Get Lost

What if the Dark Knight used Apple's state-of-the-art Maps application for turn-by-turn driving directions? Well, let's just say you wouldn't want to be in a shopping mall when Batman is in a hurry. Movieclips posted some hilarious parodies of film characters using Apple's new Maps app for directions. Just see what happens when Batman tries to use his iPhone 5 to navigate Gotham on his way to save Rachel in The Dark Knight.

How To: Cut and Sand Your Micro-SIM into a Nano-SIM Card for Your New iPhone 5

Planning on getting the iPhone 5, but want to keep your SIM card? The new nano-SIMs that manufacturers are adopting will be even smaller than the micro-SIMs that most of us currently use. It's fairly easy to cut a regular SIM down to a micro-SIM, but because the nano-SIM will be thinner as well as smaller than the micro, cutting it down to size will require a little more work. Photo by Tech Digest

How To: Moving Soon? This DIY Alarm Will Make Sure Your Stuff Stays Safe in the Truck Overnight

The worst part of moving into a new place is, well...moving. It's tedious, a lot of hard labor, and it can take forever, and don't even get me started on all those labels. It's also one of the only times in your life when everything you own can be stolen at once, since it's sitting in a movable container. Rather than risk losing everything, try this DIY Moving Truck Alarm System by Tim Flint that lets you know when the loading door is opened so you can catch would-be thieves red handed.

How To: Access the Boot Menu and BIOS in Windows 8

One of the most played-up features of Windows 8 is that it's so much faster than previous versions. So fast, in fact, that Microsoft had to change the way that users access the BIOS because 200 milliseconds just isn't enough time to hit the right key. It may take some getting used to, but it's probably a welcome change for most people, considering that the "right" key is different depending on what type of computer you're running the OS on.

How To: Build a Cheap Arduino Tachometer to Measure the RPMs of Spinning Fans (And More)

A tachometer, or RPM counter, is a device that measures the speed of something that's rotating. In a car with a manual transmission, the tachometer can be helpful in determining when to release the clutch and how much gas to give when you're taking off. This DIY Arduino Tachometer by Chris on PyroElectro uses an infrared transmitter and receiver break-beam pair to measure the RPM of a computer fan. When the fan blade passes between the transmitter and receiver, the IR beam counts the interrup...

How To: Send Your Secret Spy Messages Wirelessly Through Light with This DIY Laser Audio Transmitter

Looking to transmit some super-secret audio communications to your other spy buddies? A laser is the perfect tool for getting your sounds heard from a small distance—without anyone intercepting them— even if it's just a cover of your favorite pop song. A laser audio transmitter uses light rather than radio waves to transmit sound. This is a much more secure way to send audio communications because the laser is a focused beam of light, whereas radio waves are not controlled, so they can be pic...

RoboDoc: A Kid-Friendly DIY Robot That Makes Doctor Visits a Little Less Scary

Remember going to the doctor when you were a kid? If the word 'traumatizing' comes to mind, you'll love the RoboDoc by MarkusB, a robotic doctor that makes checkups a little less scary (and a lot more fun) for kids. It all started when Markus took his 14-month-old daughter for a checkup. The finger clip that the doctor used to check her pulse terrified her, so Markus decided to build a heartbeat monitor just for kids that's much more likely to make them laugh than cry.

How To: Make Your Own Dippin' Dots Ice Cream with Liquid Nitrogen

Dippin' Dots are a fun way to enjoy ice cream, but the price tag is not so fun. Plus, the company filed for bankruptcy last year, so they may not be around much longer. The good news is that you don't need them—you can make your own at home with some ice cream and liquid nitrogen. Redditor hypoid77 posted instructions on how to make your own DIY Dippin' Dots Maker out of a Styrofoam cooler, a couple two-liter bottles, a thumbtack, and some liquid nitrogen. Use the thumbtack to poke a 3-inch p...

News: This Giant Glass Globe Turns Moon and Sunlight into Power—Possibly Even Solar Death Rays!

André Broessel of rawlemon has developed a solar energy generator that can use both sun and moonlight to create usable power. Oh... and it's gorgeous. The device is essentially a huge glass sphere filled with water that uses a ball lens to refract light in a way that increases energy efficiency by 35 percent. It's completely weatherproof and has an optical tracking device, meaning that it can be incorporated into architecture. Here's a concept design of how it could be used to power buildings...

How To: 13 Unexpected to Downright Crazy Uses for Mason Jars

Invented by Philadelphia tinsmith John L. Manson in 1858 for canning and preserving perishables, mason jars are experiencing a major resurgence in the DIY community. In addition to being a handy storage device for both food and non-food items, its old-timey, quaintly antiquated look also makes for good drinking glasses, candle holders, flower vases and eye-pleasing decorations.

How To: Make a Simple Small Ponytail Looking Bun?

Hello! This post is for all who have medium sized or long hair and want to put them up quickly. I suggest you go for a simple small ponytail looking bun. It takes just a few seconds to make it and it looks elegant. It can push your hair a bit forward, above the forehead, so you're hairstyle does not look 'licked'.

How To: Replace the HEPA filter on a Dyson DC07 vacuum cleaner

Watch to learn how to replace the HEPA filter on a Dyson DC07 vacuum. This Dyson spare parts video we show how to remove and replace the Dyson DC07 Pre Motor Filter and Dyson DC07 HEPA Post Motor Filter. This vacuum maintenance video also outlines the Dyson airflow path as well as removal and replacement of the Pre Filter Housing, Post Filter Lid and Filter Seals. Prevent loss of suction and motor cut out by changing the filters on your Dyson.

How To: Speak Your Tweets (Egyptians Can Use Twitter via Voicemail)

You may have read an earlier post about Egypt blocking popular social websites like Facebook, Twitter and YouTube due to demonstrators disseminating videos and photographs, along with coordinating movements, during the protests against President Hosni Mubarak. In that article, you learned how to use proxy servers and VPN services to bypass those website governmental blocks.