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CubeSat rocket thruster is so small it has to be made like microchips | This tiny fingernail-length space thruster chip runs on the greenest propellant of all: water.

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Instead of one autonomous robot to fly, another to drive on land and one more to navigate on water, a new hybrid drone can do all three. To carry out complex missions, scientists are increasingly experimenting with drones that can do more than just fly.

These moisture-sucking materials could transform air conditioning. Desiccants that pull water out of the air could help cool buildings more efficiently

This startup has engineered a clever way to reuse waste heat from cloud computing. Heata is now using these busy servers to heat water for homes.

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