Enlarge / Computer illustration of mitochondria, membrane-enclosed cellular organelles that produce energy.KATERYNA KON/SCIENCE PHOTO LIBRARY/GETTY More than 1.5 billion years ago, a...
Enlarge / Spectral analysis indicates that silica is present in this supernova remnant, Cassiopeia A.NASA/JPL-Caltech/ O. Krause (Steward Observatory) Ever since neutron...
Enlarge / Birds, with their different shapes, colorful plumage and fascinating behaviors, are a delight to people all over the world. They’re also in...
Enlarge / Shareholders of the Swiss National Bank (SNB), join a demonstration against the central bank's investments in the East African Crude Oil Pipeline...
Enlarge / Even hermit crabs have individual patterns of behavior — personalities, if you like. When scientists ignore the effects of such differences, they...
