'It's always exciting to set a world record,' Tongcang Li from Purdue University said.
The object is an incredibly small silica nanoparticle—which looks like two spheres joined together when viewed through an electron microscope.
"In the 1600s Johannes Kepler saw that the tails of comets always pointed away from the sun because of radiation pressure," Li said."We use the same thing, but with concentrated lasers, to levitate and rotate the nanoparticles." In fact, the device is 600-700 times more sensitive than any other previous device that's capable of measuring torque. The Purdue team say this will enable them to measure and investigate special effects in quantum mechanics—the bizarre physics of the very small.
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