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For the most part, anyone who wants to see what’s going on inside someone else’s brain has to make a tradeoff when it comes to which tools to use. The electroencephalograph (EEG) is cheap and portable ...

Tiny gears built on silicon wafers use laser beams to spin instead of mechanical parts. By building these tiny gears onto ...

Using laser light instead of traditional mechanics, researchers have built micro-gears that can spin, shift direction, and ...