4.5 billion-year-old particles from the sun lurk in Earth's core and mantle

The Pandemic's Next Effect: A Giant Wave of Disabling Grief

New kinds of flame retardants can accumulate in orcas and even be passed to their nursing calves, scientists reported Wednesday, and it’s not yet clear what implications this has for the health of the animals.

First images from China's Mars rover Zhurong released.