"We are carrying back everything we learned, not only about where we went but ourselves," mission specialist Christina Koch told "CBS Evening News" anchor Tony Dokoupil.

Planet Earth is a world of mind-boggling extremes. From temperatures that could instantly freeze your breath to creatures that can survive the vacuum of space, our planet harbors phenomena so ...

Evolution is perhaps the most extraordinary story ever told—a tale spanning billions of years that connects every living thing on Earth through an intricate web of shared ancestry. From the tiniest ...