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TIL birds have specialized cells in their eyes that allow them to see the earth's magnetic fields. They use this for navigation during migration season.

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BVmK TIL the world’s longest lasting light bulb has been burning for the past 113 years
epNxD TIL tuberculosis was the leading cause of death in the U.S. during the 19th and early 20th centuries. An estimated 450 Americans died of the disease each day - most between the ages of 15 and 44.
w0JP TIL there was a little ice age between 1600 and 1814. The river Thames in London used to completely freeze over for 2 months per year allowing “Frost Fairs” to take place with football pitches, bowling matches, fruit-sellers, shoemakers, barbers… even a pub or two.
gMwk9 TIL about the Cod wars which were a series of confrontations between Iceland and the U.K. over fishing rights in the North Atlantic. There were three in total all of which ended in Icelandic victories.
eKog TIL that the world’s oldest still-running car is 129 years old, runs on steam, won the world’s first car race, and was auctioned for over 4 million dollars.