Plus, 13,000-year-old footprints, the James Webb telescope is delayed, and a rogue satellite makes a timely landing.
A government study found a possible link to a rare type of cancer in rats. A peer review panel met this week and endorsed the findings.
Russian cyber groups have proven they can hack their way into U.S. power stations. Is there any way to make the grid safe?
The Kepler and K2 missions have found over 2,500 planets around distant stars, but the end is coming.
Our earliest human ancestors had trading networks and advanced technology—tens of thousands of years earlier than previously thought.