Forget ruby-encrusted swords or diamond-tipped chainsaws. The scanning probe microscope is, quite literally, the sharpest object ever made. Hidden under its bulky silver exterior is a thin metal wire, as fine as a human hair. And at one end, its point tapers to the width of a single atom. Scientists wield the wire not as a weapon, but as an intricate paintbrush—using its needlelike tip to position single atoms on a tiny semiconductor canvas.

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