Physics in Action: Tiny Machines
Photo courtesy of Sandia National Laboratories, SUMMiTTM Technologies.
This photograph of a Microelectromechanical System (MEMS) crankshaft and gear also shows for scale a pollen grain, red blood cells, and a 50 micron line (50 millionths of a meter). To learn more about MEMS, visit Tiny Machines, from the American Physical Society's outreach website Physics Central.
StarChild--produced by NASA--is an online astronomy learning center for elementary and middle school students. Broad topics include the solar system and the universe (including black holes and dark matter), with lots of links providing additional information. You can choose from the elementary or middle school level. Songs and interesting questions help make it fun.