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TIL that the USA navy operates more aircraft carriers than all other navies combined - the USA operates 12, while all other nations operate 11 (China, the UK, and Italy each operate 2, while Russia, France, Spain, India, and Thailand operate one apiece)

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MedL0 TIL the best way to determine a bear's age is looking at a cross-section of its tooth. The outer part of the tooth has layers. During each hibernation, a new, narrow dark line forms there. During each growing season, a new light area forms there.
0wPMv TIL about Aristarchus of Samos, who was the first person ever to hypothesize that the Earth revolves around the Sun almost 2,000 years before Copernicus, as well as the idea that distant bodies like stars were exactly like our own Sun and contained planets.
4Xwm6 TIL That Irish-Americans account for almost 2 out every 3 US Medals of Honor awarded, and if the country of Ireland was compared to US states, it would come third to only Texas and California for the total number of MoH awarded.
xPAw TIL On September 1997, the $1 billion American warship USS Yorktown’s propulsion system failed. The Yorktown was incapacitated in the Atlantic Ocean for 2 hours and 45 minutes. The propulsion system failure was caused when the software program made an error by dividing with zero.
d8ea9 TIL: The baby thief Georgia Tann was allowed to operate a black market adoption agency in the US for nearly 30 years. She stole nearly 5000 kids from poor families and adopted them out to rich families. This went on until her death in 1950.