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TIL the most expensive error banknote is a US $20 bill with a Del Monte fruit sticker stuck to it that sold for $396K in 2021. It was discovered in 2003 when a college student got it from an ATM & sold it online for $10K. Experts believe the sticker was likely placed deliberately by a bored employee

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xVn05 TIL From 1847, Rudolf Wolf started counting sunspots. He peered through a telescope every day, if he could, and recorded the number of spots he observed. Today, all sorts of models use Wolf's sunspot record to predict things like the climate, the orbit of satellites, and the stability of power grids
XE6WP TIL In 1984 water beds were a $2 billion business with 3.4 million sold in the United States alone. At the time, 75 percent of all stores that sold water beds also offered a selection of water bed cribs.
R5pZ1 TIL that a survey of 573 Dog Owners in the Southeast US showed that given the choice between saving a person or their dog in a life threatening situation, 40% would choose the dog over a foreign tourist, 35% over a local stranger, 24% over distant cousins, and 3% over siblings and grandparents.
xV7l7 TIL Italian painter Raffaello Sanzio da Urbino also known as Rafael died on his birthday, from exhaustion brought on by unceasing romantic interests.
neJ1o TIL that McDonald's infamous ice cream machines are not always "broken" but are usually being cleaned. The whole process takes over 4 hours and they can't serve ice cream during that time. They have to do this every day.