Why don't human beings have thick fur? Scientists say it's one reason the human race has developed the way it has | Plus: The art of sweating | Survival strategies | Are we becoming a robotic society?
The company Nanoscribe is producing the most accurate 3D-printers in the world to print structures 250 times finer than a human hair. Researchers use them to print tiny robots, which may one day move inside the body.
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