How To: Build a Long Range Laser Spy System for Eavesdropping on Your Neighbors

Eavesdropping from a distance can be tricky because it usually requires some sort of bug or transmitter. It's easy to transmit audio through lasers, but you can also use lasers to build a microphone that picks up audio from a distance. LucidScience built the Laser Spy System for about $20. To make your own, you'll need a cheap laser pointer, an NPN phototransistor, a headphone amp, and a few other small pieces listed below. A light-to-sound circuit is installed in a small plastic box with the...

How To: Want Detailed Flight Data for Your Backyard Rocket? Use Your iPhone

Rockets will always be cool no matter what age you are, and building your own rocket is even better. If you have an iPhone that you aren't afraid to blast off into the sky, then you can try and build your own iPhone Rocket to record and analyze flight data, like Byte Works did. The list of parts is a little hefty, but their blog provides you with all of the information you need to make sure you have everything. The most important thing you need is the sensor tag, so that you can record the am...

How To: Are Your Gadgets Safe from Solar Storms and Nuclear Attacks?

It's September 1st, 1859, and the Earth looks more or less like something out of an apocalyptic movie or Sci-Fi novel. All communications have failed, it's so bright outside at midnight that people are getting up and making breakfast, and people all over the world are seeing auroras. The solar storm that produced the electromagnetic pulse and caused all this mayhem is known as the Carrington Event, and storms like it happen about about once every century.

News: Brain Hacking and Thought-Controlled Quadcopters: The Good and Bad Future of Mind-Reading Devices

Until recently, brainwave-reading devices have pretty much only existed in science fiction. Sure, electroencephalography (EEG), the technology that powers these devices, has been used in medicine and psychiatry since the late 1800s, but diagnosing people's brains and reading their minds are two totally different things. The first EEG headsets available to the public were used mostly in gaming and even in fashion, but in the last few years, they've gotten a little more sophisticated.

How To: Build a Bomb-Defusing Robot Tank for the Revolution

War leaves a lot of stuff behind. Torn families, delegitimized institutions, mass graves, and unexploded ordinances litter the post occupation landscape. Whether or not you have driven the imperialist out, or are still in the phase of armed resistance, you will need the ability to safely diffuse bombs. My bomb defusing Silvia-bot can do it all. She can catch grasshoppers, cut wires, collect samples, tase enemies and even play chess! Materials

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...

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...

News: Freaking DIY Magma! Syracuse University Creates Recyclable Red-Hot Lava Flows

Believe it or not, it's possible to make your very own lava—if you have a furnace capable of heating up to 1,200 degrees Celsius, that is. Bob Wysocki and Jeff Karson started the Syracuse University Lava Project to study basaltic lava and give students a hands-on way (hypothetically, of course) to learn about it. Oh, and they also want to use it for art projects. Sign me up for that class! It all starts with 1.1 billion-year-old basalt gravel, which apparently anyone can buy. They put the gra...

News: Potassium Chlorate—How Pyromaniacal Mad Scientists Take Care of Cockroaches and Pesky Gummy Bears

Pyromania is definitely nothing new on WonderHowTo. From flamethrowers and hydrogen fireballs, to flame-making pistons and wine corks, to simply burning steel wool fireworks and DIY smoke mix, we've covered it all. But when pyromaniacal mad scientists feel the need to release some tension in the lab, gummy bears and cockroaches become the victims of euphoric oxidation by way of molten potassium chlorate. A recent video by famous YouTube chemist NurdRage shows one of mankind's most despised cr...

How To: Find Hidden Blood Splatter Stains on Your Walls with This Infrared Photography Hack

I'm sorry to say, but Dexter Morgan hasn't thought of everything. Just because he's the best blood splatter analyst in the Miami metro area, doesn't mean he can't be taught a thing or two about blood. In fact, I'm sure this is something he'd be glad to know. Spotting a bloodstain is pretty easy at a crime scene, especially when there was no attempt to cover it up. When the scene has been wiped clean, there are still ways for forensic investigators to detect washed away blood, like using a rea...

How To: Build a Frame for the Mega Solar Scorcher

Here is how you can build a frame for your MEGA SOLAR SCORCHER in under an hour, and for less than $8!! This is effectively a 4 foot magnifying lens that concentrates insane amounts of heat from the sun. What would you do with all this free solar power? My design for this custom "Scorcher Frame" is easy to use, and incredibly cheap to make, as you can see in this step-by-step video.

Prev Page