December 25

Tuesday 25, 1973:

The ARPANET crashes when a programming bug causes all ARPANET traffic to be routed through the server at Harvard University, causing the server to freeze.

Thursday 25, 1947:

The Constitution of the Republic of China goes into effect.

Monday 25, 1939:

Rudolph the Red-Nosed Reindeer is introduced by Montgomery Ward stores

Friday 25, 1914:

World War I: The Christmas truce: Just after midnight on Christmas morning, German and British troops on the Western Front cease firing their guns and artillery and sing Christmas carols. Crossing the No man's land, they trade gifts with the enemy forces that face them. They also played a game of soccer with a makeshift soccer ball (fashioned by the Germans) This truce lasts for several days, depending on the location.

Monday 25, 1223:

Saint Francis of Assisi assembles the first Nativity scene.