EARTH
Why Do the Northern and Southern Lights Differ?
Scientists have discovered the culprit: how the sun squeezes Earth’s magnetic tail
Stories by Katherine Wright
Environment
Icebergs Can Be Green, Black, Striped, Even Rainbow [Slide Show]
Seawater, algae and lack of cracks can create colors other than white
Space & Physics
New Detector Could Soon Narrow Down Gravitational Wave Sources
Two U.S. detectors will soon be joined by an instrument in Italy that could help solve the mystery of where gravitational waves originate
The Sciences
Think You Know Rainbows? Look Again [Slide Show]
Physicists are starting to explain how rainbows can be completely red, white, nearly flat or full-circle
