It's been just over 21 years since one of the darkest days in NASA's history. On the morning of February 1, 2003, Space Shuttle Columbia disintegrated as it reentered the atmosphere over Texas and Louisiana. The seven astronauts aboard – David Brown, Rick Husband, Laurel Clark, Kalpana Chawla, Michael Anderson, William McCool and Ilan Ramon – all lost their lives. The tragic event is being retold for a BBC Two documentary series airing from this week on BBC Two, 'The Space Shuttle That Fell to Earth'. MailOnline has revealed a step-by-step graphic showing exactly what went wrong on that fateful morning, which changed NASA forever.

David Brown is Professor of Mathematics and Statistics at Utah State University. A while back he gave a talk in the Science Unwrapped series from the College of Science titled "Artificial Intelligence: Too Late to Stop the Robot Apocalypse?" Professor Brown says "Perhaps ironically, salient technology superstars, like Elon Musk and Bill Gates, and publicly known geniuses, like Stephen Hawking, have spoken out and warned us about the advent of artificial intelligence (AI). On the other hand, doing so won them the Luddite Award from CNET, and'alarmist' labels from WIRED and E & T magazines. Is AI the next atomic bomb and are AI research labs the next Los Alamos? If Yes, are there nevertheless compelling reasons to pursue AI?