No ocean-borne radiation from Japan’s Fukushima nuclear power plant disaster has yet been detected in analysis of kelp samples along the western U.S. coastline.
Here's why climbers use supplemental oxygen to climb Mount Everest. Also, the curtailment of the 2014 Everest climbing season following a deadly avalanche.
In her short animated documentary - called Why Do I Study Physics? - Xiangjun Shi finds beauty in both the orderly world of physics and the chaos of real life.
This video shows happened in Baltimore's busy Charles Village neighborhood Wednesday, when a retaining wall buckled and sent cars and mud tumbling onto railroad tracks below.