Event:
Flight readiness firing of Challenger's main engines; 20 seconds
More Notable Events on December 18:
1991 General Motors announces closing of 21 plants
1987 Ivan F. Boesky sentenced to 3 years for insider trading
1976 Wonder Woman debuts on ABC
1961 Wilt Chamberlain of NBA Philadelphia Warriors scores 78 points vs LA
1960 General Meeting of United Nations condemns apartheid
