Today we remember the Columbia STS-107 mission and its seven crew members, Rick D. Husband, William C. McCool, David Brown, Laurel Blair Salton Clark, Michael P. Anderson, Ilan Ramon, and Kalpana Chawla, who passed away twenty years ago today, Feb. 1, 2003. The STS-107 mission began with a spectacular liftoff from Launch Pad 39A at NASAKennedy Space Center in Florida, at 10:39 am EST on Jan. 16, 2003. During routine analysis of launch films, engineers noted that at about 82 seconds into the flight, a piece of foam insulation released from the Shuttle’s External Tank (ET) appeared to strike Columbia’s left wing. When engineers on the ground requested high-resolution imaging of the affected area to complete a more thorough analysis, managers ultimately turned down the request. After spending 16 days in space conducting dozens of U.S. and international experiments, the astronauts began the journey to return to Earth. Fifteen minutes after entry interface, flying over Texas at an altitud...