Obituary: Roger Boisjoly

Engineer Roger Boisjoly (b.1938) died on January 6. Boisjoly worked for Morton Thiokol in 1986 and warned NASA that due to falling temperatures, the O-Rings on the space shuttle Challenger could undergo a catastrophic failure and urged for them to cancel the flight. The next day, his predictions came true when Challenger exploded 73 seconds into its flight.