During World War 2, a bear named Wotjek joined the Polish army. He carried ammunition and occasionally drank beer.
The oceans contain 200,000 different kinds of viruses.
A German and British aeroplane shot each other down in Norway during WWII. The crew met and helped each other survive. Two of them later visited each other many years after the war was over as friends.
Dr. Seuss wrote Green Eggs and Ham as part of a bet.