propellers
Winged Microchips Are the Smallest Flying Machines Made by Humans
The biodegradable fliers are the size of sand grains, and could be used to track airborne pathogens, monitor pollution, or collect scientific data.
Really Big Propellers Are Powering Greener, Smarter Ships
Cruise ships are never going to be great for the environment, but at least they can be less awful.
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