Science

How do you prove a rock was actively shaped and used as a tool more than 3 million years ago? Scientists found a kit of more than 140 artifacts in one spot and say the tools' crafters were pre-human.

What controls aging? Biochemist Cynthia Kenyon has found a genetic mutation that can more than double the lifespan of a tiny worm, which points to how we might one day significantly extend human life.

Medical ethicist Harvey Fineberg says "neo-evolution" is on the horizon. When it becomes easier to eliminate disease through gene therapy, will we change the trajectory of evolution?

Avian influenza is ravaging poultry flocks across the Upper Midwest. The virus is "doing things we've never seen it do before," and understanding about transmission is very limited, a scientist says.

The latest estimates from the U.S. Census Bureau show the 15 cities with the biggest population increases were in the South and West — with two exceptions: New York City and Columbus, Ohio.

Expensive versions of prescription opioids that are tougher to cut, crush and inject are less likely to be abused, legislators hope. But some doctors call the bill well-meant, but ill-advised.