On April 12th, 1945, President Franklin D. Roosevelt died, and Harry Truman was inaugurated as President of the United States.

On April 11th, 1970, Apollo 13 was launched.

On April 10th, 1912, the RMS Titanic begin its ill-fated voyage.

On April 9th, 1967, the first Boeing 737 took its maiden flight.

On April 8th, 1742, Handel's "Messiah" was performed for the first time, in Dublin.

On April 7th, 1805, Beethoven's Third Symphony was performed publicly for the first time.

On April 6th, 648 BC, the ancient Greeks made the first documentation of a solar eclipse.

On April 5th, 1621, the Mayflower set sail from Plymouth to return to Great Britain.

On April 4th, 1581, Francis Drake completed his circumnavigation of the world and was knighted by Elizabeth I.

On April 3rd, 1860, the first Pony Express run was begun.

On April 2nd, 1513, Ponce de Leon became the first known European to set foot on Florida.

On April 1st, 1826, Samuel Morey patented the internal combustion engine.

On March 31st, 1889, the Eiffel Tower was inaugurated.

On March 30th, 1867, Secretary of State William H. Seward purchased Alaska for $7.2 million, a move referred to by the media as "Seward's Folly."

On March 29th, 1871, the Royal Albert Hall was opened by Queen Victoria.

On March 28th, 1979, a failure in a cooling system at Three Mile Island resulted in contamination of the water from nuclear waste.

On March 27th, 1513, Ponce de Leon sighted America for the first time.

On March 26th, 1958, the United States army launched Explorer III.

On March 25th, 1655, Christiaan Huygens discovered Titan, Saturn's largest moon.

On March 24th, 1989, the Exxon-Valdez oil spill occured in Alaska's Prince William Sound.