gadgets Camera the size of a grain of salt not much use for surveillance, but great for inspecting urethras Rob Beschizza
digital bridges Paralyzed 40-year-old man walks again after doctors gave him brain and spine implants Carla Sinclair
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neuroscience New brain-computer interface writes up to 90 characters per minute with your thoughts Thom Dunn
Science Why do these rabbits do handstands and walk on their front paws instead of hopping? David Pescovitz
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