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TIL that the oldest known photo of a U.S. president is of John Quincy Adams. The photo was taken in 1843.

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j6e0E TIL Hummingbirds have an exceptional memory due to an enlarged hippocampus. This allows them to remember the exact location of specific hummingbird feeders along their migration path from North America to Mexico, the Caribbean, and Central America.
kOVyg TIL about Peto's Paradox, a paradoxical observation stating that contrary to what you would think, larger organism have lower rates of cancer than do smaller ones.
nWrQo TIL the term “420” originated from a high school in San Rafael, CA
grPrL TIL of George Francis Train. He founded railroads, built parts of the transcontinental railroad and found a horse drawn tram in London. He traveled around the world in 80 days in 1870 and claimed: "Verne stole my thunder. I'mPhileas Fogg".
4jwJ TIL Gauss personal diaries indicate that he had made several important math discoveries years/decades before his contemporaries published them. Math Historian Temple Bell said that if Gauss had published all of his discoveries in a timely manner, he would have advanced mathematics by 50 years.