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TIL some indigenous people are known to have deciphered bird language and used it to locate predators that birds were warning other birds about

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4kBKg TIL Sand Dollars Are Animals
yVL8X TIL Mosquitoes are the most dangerous animal in the world, killing 725,000 humans per year through spreading diseases such as malaria. Only female mosquitos bite, making them the most dangerous.
GYbG4 TIL a piece of the Berlin Wall can be found in the men's bathroom of the Main Street Station Hotel in Las Vegas. It is unclear how it ended up there but the nearly 10-feet wide and 6-feet tall piece of the wall is encased in glass to prevent damage.
J1MXv TIL that after Freddie Mercury died, his parents burned (almost) all his belongings in accordance with his religion, Zoroastrianism. His stamp collection resides at The Postal Museum.
yQ9gX TIL that the US flag was not the first flag on the moon. It was a "flag" from the University of Bern (Switzerland) that was used to capture solar wind particles, and was planted first to maximise the experiment's duration.