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TIL that Arnold Schwarzenegger made his first million BEFORE he became famous in movies... by selling real estate

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X5pD TIL in the movie “Deja Vu”, Denzel Washington’s character had to have already gone back in time at least once before the start of the movie for all of the plot elements to make sense.
7rZNp TIL in the 1950s the US Government investigated a person named Robert Dorr because he kept writing to Boeing and asking for pictures of their planes. They discovered Dorr was a just teenager who loved planes, an "average and loyal American boy." He grew up to be a diplomat, author, and TV pundit.
Wk9WL TIL: When roosters open their beaks fully, their external auditory canals completely closed off. Basically, roosters have built in earplugs. This helps prevent them from damaging their hearing when they crow.
xVYD TIL the probability of a song becoming a hit can be estimated by using an algorithm.
AD7Vg TIL that during WWII, the British launched nearly 100,000 weather balloons trailing long metal wires toward occupied Europe, causing power outages when they shorted out power lines and causing at least one German power station to burn down.