More rain lashes storm-battered California

Heavy rain lashed water-logged California Monday, with forecasters warning of floods as a parade of storms that have killed 12 people battered the western United States.

MESSENGER reveals a more dynamic Mercury surface

Compared with Earth, the surfaces of most other objects in the solar system appear largely static. Planetary scientists have long believed that impacts from space debris are the principal source of change on these surfaces ...

Giant viruses build a cell nucleus surprisingly like our own

Humans aren't the only targets for viruses. Like us, bacteria become infected by many types of viruses. In fact, across billions of years, bacteria and viruses have engaged in a non-stop evolutionary arms race for survival ...

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