On December 20th, 1951, nuclear power was first harvested when EBR-1 lit four light bulbs.

On December 19th, 1972, Apollo 17 returned to Earth.

On December 18th, 1966, Saturn's moon Epimetheus was discovered.

On December 17th, 1903, the Wright Brothers made their first powered Heavier-than-Air flight in the Wright Flyer at Kitty Hawk.

On December 16th, 1773, the Boston Tea Party took place.

On December 15th, 1965, the Gemini 6A was launched from Florida.

On December 14th, 1896, the Glasgow Underground Railway was opened.

On December 13th, 1545, the Council of Trent began.

On December 12th, 1781, the HMS Victory defeated the French fleet during the Revolutionary War.

On December 11th, 1872, P.B.S. Pinchback was sworn in as the first African-American member of the U.S. House of Representatives.

On December 10th, 1901, the first Nobel Prizes were awarded.

On December 9th, 1851, the first YMCA in North America was established in Montreal.

On December 8th, 1609, Biblioteca Ambrosiana, the second public library in Europe, opened.

On December 7th, 1732, the Royal Opera House opened at Covent Garden, London.

On December 6th, 1849, abolitionist Harriet Tubman escaped from slavery.

On December 5th, 1776, the Phi Beta Kappa fraternity was founded, making it the first scholastic fraternity in the United States.

On December 4th, 1110, the Crusaders conquered Sidon in the First Crusade.

On December 3rd, 1904, the Jovian moon Himalia was discovered.

On December 2nd, 1848, Franz Joseph I became King of Austria.

On December 1st, 1990, the Channel Tunnel sections started from the United Kingdom and France met forty meters beneath the seabed.