Roger Boisjoly, 73, Dies; Warned of Shuttle Danger, NY Times
"Six months before the space shuttle Challenger exploded over Florida on Jan. 28, 1986, Roger Boisjoly wrote a portentous memo. He warned that if the weather was too cold, seals connecting sections of the shuttle's huge rocket boosters could fail. "The result could be a catastrophe of the highest order, loss of human life," he wrote. The shuttle exploded 73 seconds after launching, killing its seven crew members, including Christa McAuliffe, a high school teacher from Concord, N.H."

