If discovered, sterile neutrinos may explain dark matter.
New chip could help test drugs for ALS, other neuromuscular disorders.
Two potentially habitable planets in nearby system are confirmed to be rocky.
Neutrinos traveling 450 miles have no individual identities, according to MIT analysis.
Scientists find gas at center of Perseus cluster travels much more slowly than expected.
Low-intensity fields keep malignant cells from spreading, while preserving healthy cells.
September ozone hole has shrunk by 4 million square kilometers since 2000.
Experiments show planet cooled dramatically in half a billion years.