Skywriting was invented by the Royal Air Force in World War I to send messages to troops on the ground. After the war, Pepsi built a fleet of skywriting biplanes.
William Henry Johnson was awarded the Medal of Honor in 2015 for fighting off a German raid in hand-to-hand combat, killing multiple German soldiers and rescuing a fellow soldier while experiencing 21 wounds on May 14, 1918.
Kleenex was invented and intended as a paper filter for gas-masks during World-War I.
The first battle of WWI consisted of a British ship firing a single shot at a German ship on Lake Nyasa (now Lake Malawi) in Africa, and taking the captain “prisoner.” The two captains had been drinking buddies for years, and weren’t about to let the war ruin it.
Captain Berndt, in command of the ship Von Wissmann, was stunned when his friend opened fire, and rowed out to confront him, yelling: “G#* damn, Rhoades, are you drunk?”
Before dogfighting was a thing, enemy pilots would simply exchange waves or shake their fists at one another. At the beginning of WWI, recon pilots would often resort to throwing bricks, grenades, and even rope in hopes that it would get entangled in the enemy’s propellor.
In WWI, many British naval ships were painted with “Dazzle Camo”, a camouflage scheme designed not to make them hard to see, but rather to create a confusing perspective that made judging ship type, speed, and direction difficult.
When Archduke Franz Ferdinand was murdered in his car – triggering the start of World War One – the number plate of his and his wife’s car read “AIII 118”. 11/11/18 was the date when the armistice was finally signed.
The phrase “The First World War” was used as early as 1918, by a journalist who felt it would not be the last.
Tolkien developed a secret code with his wife in WW1, strictly illegal, so that she could track his progress on the map.
Upon discovering an abandoned printing press in Belgium during the first world war, British soldiers decided to start publishing their own satirical newspaper from the trenches.