The partial skeleton of a three year old child, uncovered in central Alaska, dates back to 11,500 years ago. It's one of the oldest human remains found in North America.
Robert Falcon Scott and his team did not reach the South Pole first. But their expeditions have let scientists analyze a century's worth of Antarctic marine seabed data.
Rocks on Mars from its early history – almost four billion years ago - suggest there might have been a habitable environment underneath the surface of the planet.