While computing power consumption is not at the top of the list of the most egregious energy drains, it is a large enough source on the grid that it warrants creative thinking, especially in the context of server farms. Not only are server clusters a more concentrated power draw than individual computers, but the energy needed to house and cool them is a significant source in and of itself. Two new ideas—one in theory and one in practice—aim to address these questions with novel solutions.

The last few years have seen tremendous growth in solar thermal power plants—huge arrays of mirrors that concentrate the sun's energy onto a liquid which then boils and spins a turbine. The process is generally more efficient than using photovoltaic panels, and new solar thermal plants under construction in Spain and Australia will be among the largest capacity solar plants in the world. Old-fashioned PV panels were starting to look archaic, or at least suitable only for small-scale projects like roof instillations. But not all PV panels are created alike.

It sounds as if someone just dropped a tricycle into a meat grinder. I’m sitting inside a narrow conference room at a research facility in Bristol, Connecticut, chatting with Joseph Longo, the founder and CEO of Startech Environmental Corporation. As we munch on takeout Subway sandwiches, a plate-glass window is the only thing separating us from the adjacent lab, which contains a glowing caldera of “plasma” three times as hot as the surface of the sun.

For a closer look at the wildest repurposed rigs, launch the photo gallery by clicking 'View Photos' at left. And to see what happens when the power-tool racers come across a gas-powered ring of fire and a few cold beers, see the video at the bottom of the page.

It’s a rocket. Stuck through the back of a skull, sitting on an aging belt sander rigged to a pair of sawed-off skis. And it can haul butt down a track.

Click "View Photos" at left to come along on PopSci's test drive of the impossibly fast Bugatti Veyron 16.4.

The smaller your camera, the more susceptible it is to even the slightest tremble, which can leave your photos looking like Impressionist paintings. Fortunately, optical image stabilization has trickled down from pro cams to the shake-prone pocket models. The cameras use motion sensors to detect any quiver and move a piece of the lens to compensate for it. I tested three in the most blur-inducing scenarios: in low light without a flash—the slow shutter speed gives you more time to twitch—and at full zoom, which magnifies shake.

Cycle your way out of traffic jams and high fuel costs—without breaking a sweat. Simply slide a canister of gasoline into your water-bottle holder, clip a throttle to your handlebars, and swap your front wheel for the Wheel, designed by Denver-based RevoPower (revopower.com). The Wheel’s hub holds a 23cc, two-stroke internal combustion engine and a superthin gear train; less than three inches thick, it all fits between the prongs of your bike’s front fork.

The promise of Wi-Fi is freedom—the ability to bring your laptop or PDA away from the anchor that is your desk and into your life. With most wireless routers, however, your life had better stop at around 300 feet, and forget about heading outside. Between the noise generated by other local wireless devices and physical obstacles like furniture and walls, chances are your Wi-Fi signal is little more than a whisper by the time it hits your backyard. So I built a box that can pick up that signal and boost it another 200 to 300 feet.

Quick, how many cables go into the back of a wireless (a.k.a. Wi-Fi or 802.11) netcam? That would be one: a power cord.

How many cables go into the back of a wired netcam, which hooks directly into your ethernet? Also one, if you’re using PoE (power over ethernet). PoE takes advantage of the fact that only two of the four twisted pairs of wire (connected to pins 1/2 and 3/6) in a standard Cat5 ethernet cable carry signals. The other four wires are available to deliver power to your camera or whatever other AC-powered device you have on the network.