This is what happens when you drop a laser into a vat of liquid nitrogen

Dropping stuff into liquid nitrogen is always a fun experiment, but it doesn’t always have the same effect on all objects. Whereas most things will simply freeze and become extremely brittle (and really fun to smash with a hammer, we might add), some strange things happen when you drop electronics into the super-cooled gas.

To demonstrate exactly what happens, YouTube sensation and laser aficionado Styropyro (the same guy who made that ridiculous 40-watt laser shotgun) posted a new video this week, in which he and a few of his friends submerge a bunch of lasers and LEDs in liquid nitrogen.

The result is pretty crazy. It turns out that when you bring the temperature of an LED or laser down to a ridiculously low temperature (liquid nitrogen is about -196 degrees Celsius), it robs the diode’s semiconductor of most of it’s thermal energy. According to Styropyro, “this causes the ‘bandgap’ energy to increase, thereby increasing the emitted photon energy and decreasing the emission wavelength.”

In plain English, that basically means that the extremely low temperature changes the color of the laser, bringing it down the color spectrum. A yellow diode, for example, will gradually shift to green as it gets colder. A red laser, on the other hand, will begin to turn orange, and eventually take on an almost yellow color.

Styropyro doesn’t show it in the video, but the effect also works in reverse — as the laser diode slowly warms up, the wavelength of light it emits will slowly climb back up the spectrum and return to its original color.

Practical? Not particularly. Awesome? Absolutely. High school teachers and college professors should totally use this experiment as a physics demonstration to get students pumped up about science!

Emerging Tech

This exotic new material somehow gets thicker when stretched

Scientists at the U.K.’s University of Leeds have discovered a synthetic material which actually gets thicker the more it’s stretched. Here are some of the things it could be used for.
Home Theater

OLED or LED? We pick the winner in the battle of competing TV tech

The acronyms OLED and LED sound and look very similar, but the two technologies are vastly different in terms of engineering, performance, and capabilities. Which technology wins when you pit OLED versus LED in a TV?
Home Theater

QLED and OLED may have similar names, but they're totally different technologies

The names may look almost identical, but OLED and QLED are two entirely different beasts. In our QLED vs. OLED battle, we dissect the differences between these dueling TV technologies, and help determine which might be best for you.
Emerging Tech

Early-detection system for wildfires could save many states from big burns

When it comes to dealing with the growing problem of raging wildfires, a new wireless smart sensor system could help spot burgeoning blazes before they rage out of control. Here's how it works.
Outdoors

Light up the night! Here are the five best headlamps money can buy

Headlamps make all the difference when camping or walking the dog at night, especially when you're in need of both hands. From Black Diamond and Petzl to Coast here are some of the best headlamps on the market.
Emerging Tech

Elon Musk to unveil tunnel elevators and autonomous pods on December 18

We'll soon learn if Elon Musk's high-speed tunnel plan is a serious effort at ending traffic jams or little more than a fancy theme park ride. A big unveiling event is coming on December 18, a week later than originally planned.
Emerging Tech

Hear the sounds of wind on Mars from InSight’s latest audio recording

NASA's InSight craft has captured the sound of the wind blowing on the surface of Mars. The audio file was picked up by the air pressure sensor and the seismometer which detected vibrations from the 10 to 15 mph winds in the area.
Emerging Tech

The best drone photos from around the world

Most of today's drones come equipped with high-end cameras, which are quickly revolutionizing the world of aerial photography as we know it. Here are some of the best drone photos from around the world.
Emerging Tech

Feast your eyes on the wildest, most elaborate Rube Goldberg machines ever built

Want to see something totally mesmerizing? Check out several of the best Rube Goldberg machines from across the internet, including one that serves cake and other that do ... nothing particularly useful.
Emerging Tech

The 20 best tech toys for kids will make you wish you were 10 again

Looking for the perfect toy or gadget for your child? Thankfully, we've rounded up some of our personal favorite tech toys, including microscopes, computer kits, and a spherical droid from a galaxy far, far away.
Emerging Tech

Scoot your commute! Here are the 9 best electric scooters on the market

Electric scooters are an affordable, convenient way to minimize your carbon footprint and zip around town. Check out 8 of our current favorites, whether you're working with a budget or have some cash to spare.
Emerging Tech

Sick of walking everywhere? Here are the best electric skateboards you can buy

Thanks for Kickstarter and Indiegogo, electric skateboards are carving a bigger niche than you might think. Whether you're into speed, mileage, or something a bit more stylish, here are the best electric skateboards on the market.
Features

Has Columbus, Ohio raised its IQ yet? A progress report from the mayor

Two years ago, the city of Columbus in Ohio received $40 million to pursue smart city initiatives. So, what’s happened since then? We spoke with its mayor, Andrew Ginther, to discuss progress and what’s ahead.
Emerging Tech

Awesome Tech You Can’t Buy Yet: Folding canoes and ultra-fast water filters

Check out our roundup of the best new crowdfunding projects and product announcements that hit the web this week. You may not be able to buy this stuff yet, but it sure is fun to gawk!