Earth Matters

Dark matter 'hairs' may grow out of Earth

How to take part in the Christmas Bird Count

'Racing Extinction' sounds the alarm on Earth's disappearing species

10 national animals that are rare, unusual, endangered or completely nonexistent

An intimate look at Yellowstone's most famous grizzly mama

10 mind-boggling slow-motion videos of nature

What is this weird purple slime that is clotting Norway's fjords?

​Blue Origin makes history with reusable rocket

How Mars could become a ringed planet

Photographers capture the extraordinary landscape of Mono Lake

Puma returns to rain forest after 20 years in chains

Bid farewell to Nola, one of the last northern white rhinos on Earth