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TIL: A tiger’s roar has a frequency that is silent to human ears but can paralyze its prey because it is so low and loud.

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via reddit.com

kwB1 TIL that in 1959, 9 hikers went missing on “Dead Mountain” in Siberia. Their tent was found ripped open from the inside and although the corpses showed no signs of struggle, two victims had fractured skulls, two had broken ribs, and one was missing her tongue. Only their footprints were present.
dDnGd TIL that during WWII, Britain took down around 50,000 road signs so German invaders wouldn’t know where they were going.
ANXax TIL that because baseball player Shoeless Joe Jackson was illiterate, and his wife usually signed his name, his actual autographs are very valuable. A signed photo of himself was the highest price ever paid for a sports photo, $1.47 million.
Oorne TIL: Researchers taught African grey parrots to buy food using tokens. They were then paired up, one parrot given ten tokens and the other none. Without any incentive for sharing, parrots with tokens started to give some to their broke partners so that everyone could eat.
P1KrL TIL about "Noah's syndrome" - an extreme form of animal hoarding disorder