NASA’s week of mourning

NASA’s week of mourning begins tomorrow. The three deadly accidents in NASA’s history all happened in late January/early February. Apollo 1 caught fire 45 years ago on January 27, 1967, killing Grissom, White and Chaffee. Challenger exploded 26 years ago, on January 28, 1986, killing all seven on board. And Columbia broke up during reentry on February 1, 2003, just nine years ago, killing another seven people. Why these accidents all happened during the same calendar week remains a mystery.