The big five mass extinctions

Biologists suspect we’re living through the sixth major mass extinction. Earth has witnessed five, when more than 75% of species disappeared. Use this article to investigate how the Earth has changed over time long before humans arrived. It is suited … Continued

Columbia: NASA blew it

Word Count / Video Length: 379 / 10:00 mins NASA’s return to space after the Columbia disaster was “ugly” and fraught with internal arguments and mistrust, says Charles Camarda – a NASA astronaut who flew on the mission. This gripping … Continued