Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
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The first chocolate eggs were made in Germany in the 19th century and remain one of the most popular Easter candies today.
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Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
'⸮' is a punctuation mark that was first proposed in the 1580s to denote sarcasm or irony.
17
In 1518, a "dancing plague" struck Strasbourg, Alsace, whereby hundreds of people danced fervently in the streets over the period of a month. Some suffered heart attacks or strokes, and many others died from sheer exhaustion. It remains unexplained.
19
The oldest glowing lightbulb was first switched on in 1901 and lives in fire stations in Livermore, CA. It is known as the Centennial Light.
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