An anonymous reader writes: Einstein worked on Brownian motion (the movement of small particles in a fluid as they collide with water molecules) in 1905, but said it would be "impossible" to determine the speed and direction of a single particle during this dance. Now researchers have gone and done it, by suspending a dust-sized glass sphere in air (which slowed down its dance moves, since it had fewer collisions with spaced-out air molecules than it would have with water molecules). The researchers held the sphere in place with "laser chopsticks," and then watched how the glass bead bounced around to determine its direction and speed.
DEAL: For $25 - Add A Second Phone Number To Your Smartphone for life! Use promo code SLASHDOT25. Also, Slashdot's Facebook page has a chat bot now. Message it for stories and more. Check out the new SourceForge HTML5 internet speed test! ×