HISTORY LESSON
1777: During the American Revolutionary War, Gen. George Washington led his army of more than 12,000 soldiers to Valley Forge, Pennsylvania, to camp for the winter.
1907: Two hundred-thirty-nine workers died in an explosion at the Darr coal mine near Van Meter, Pennsylvania.
1960: Fire broke out on the hangar deck of the nearly completed aircraft carrier USS Constellation at the New York Naval Shipyard, killing 50 civilian workers.
1972: Apollo 17 splashed down in the Pacific, concluding the Apollo program of crewed lunar landings.
1907: Two hundred-thirty-nine workers died in an explosion at the Darr coal mine near Van Meter, Pennsylvania.
1960: Fire broke out on the hangar deck of the nearly completed aircraft carrier USS Constellation at the New York Naval Shipyard, killing 50 civilian workers.
1972: Apollo 17 splashed down in the Pacific, concluding the Apollo program of crewed lunar landings.