Circadian rhythm
By Richard Chasey, posted on December 3rd, 2008 in Biodiversity
Originally Published by Newly Published Articles - Encyclopedia of Earth
A circadian rhythm is a periodic pattern of behavior that repeats after approximately one day has passed. Read Full Article…
NASA Daily Image
Panorama of the East Coast
This Jan. 29 panorama of much of the East Coast, photographed by one of the Expedition 30 crew members aboard the International Space Station, provides a look generally northeastward: Philadelphia-New York City-Boston corridor (bottom-center); western Lake Ontario shoreline with Toronto (left edge); Montreal (near center). An optical illusion in the photo makes the atmospheric limb and light activity from Aurora Borealis appear "intertwined." Image Credit: NASA