It would take 1000 of these tiny race cars to be as wide as a human hair!
3-D printers are really cool and are used for rapid prototyping and other things all around the world. Most of the stuff these printers are used for is large enough that we could hold them in our hand to inspect up close with the naked eye. At Vienna University, researchers have created a 3-D printer that can print exceptionally small, yet highly detailed items.
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The printer was used to print a tiny Formula 1 racing car that's only 285 nm long making it about 1/1000 of the width of a human hair. The printer uses a tiny laser to harden layers of liquid resin to a solid. The printer uses a laser beam is only two photons wide.