Crossing the threshold for laser cooling

(Phys.org) —Gallium nitride has emerged as one of the most widely used materials in the optoelectronics industry and the most important semiconducting material after silicon.

White, green or black roofs? New report compares economic payoffs

Looking strictly at the economic costs and benefits of three different roof types—black, white and "green" (or vegetated)—Lawrence Berkeley National Laboratory (Berkeley Lab) researchers have found in a new study that ...

Astronauts complete rare Christmas Eve spacewalk

Space station astronauts repaired a crippled cooling system during a rare Christmas Eve spacewalk Tuesday, braving a "mini blizzard" of noxious ammonia as they popped in a new pump.

Cooling inspired by sweat

In many of today's electronics, the price we pay for speed comes in the form of heat. As the number of processors on a computer chip increases, so does the amount of heat each chip generates—and there's a greater chance ...

NASA orders urgent spacewalk repairs at station

NASA has ordered up a series of urgent spacewalks to fix a broken cooling line at the International Space Station, a massive repair job that could stretch to Christmas Day.

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