Great World Wide Star Count
(October 5-19, 2012) International event encourages everyone to go outside, look skywards after dark, count the stars they see in certain constellations, and report what they see online

World Water Monitoring Challenge™ International education and outreach program that builds public awareness and involvement in protecting water resources around the world by engaging citizens to conduct basic monitoring of their local water bodies. The program runs annually from March 22-Dec. 31

Fold It  You solve geometric puzzles online in a game setting, in the process helping scientists at the University of Washington and elsewhere unravel complex protein structures

USGS’s "Did You Feel It?" Earthquake reporting

Citizen Sky Amateur astronomers monitor brightness changes of variable star