The spanish flu caused about a third of total military death in WW1.
WW1 was the sixth deadliest conflict in world history.
During WW1, the U.S. Government tried to rename hamburgers as "liberty sandwiches" to promote patriotism.
WW1 ended on 11 o'clock in the morning at the 11th hour of the 11 month in 1918.
WW1 transformed the US military into the largest military power in the world.
During WW1, the King of England, the Tsar of Russia, and the Emperor of Germany were all first cousins.
A WW1 homing pigeon saved 194 men by delivering a message despite losing a leg, an eye and having been shot through the chest.
During WW1, a Hungarian man was shot in the frontal lobe, making it impossible for him to fall asleep. He continued to live a full, sleepless life.
The German WW1 officer that recommended Hitler for an Iron Cross was Jewish. He was later arrested, then released by the SS once they discovered his identity.
After World War I, there were so few men in Germany that only 1 in 3 women would find a husband.
After WW1, Finland, Estonia, Latvia, Lithuania, and Poland emerged as independent nations.
WW1 allied soldiers would fire thousands of rounds at random over the German trenches to boil the water in their machine guns to make tea.
The youngest soldier to serve during WW1 was only 8 years old.
Germany made its final reparations payment from the WW1 Treaty of Versailles in 2010.
The last surviving WW1 Veteran was a woman. She was a waitress at an air base.
Anne Frank's father was an officer in the German army during World War I.