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TIL despite their strength and size, elephant's backs are not designed to carry weight as their bones actually extend upwards. This puts their spine at risk of 'caving in' when used for work like tourist rides. Left, ex-riding ele with caved-in back; Right, normal dome-shaped back.

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4kMbw TIL The only plane permitted to fly on 9/11 after the attacks was a plane flying from San Diego to Miami to deliver anti-venom to a man bitten by a highly poisonous snake; it was escorted by two fighter jets
ne1B7 TIL That acorns are edible with a little prep, and can eaten roasted, turned into flour, or even used as a coffee substitute.
Bgrlb TIL the hummingbird brain is 4.2% of its body weight, twice higher than the human brain at only 2% proportionally.They remember well their migration routes, and the yard and flowers they visited the previous year. Some consider them sacred, and in mythology they are healers helping people in need.
M77RW TIL that sunsets on Mars are blue
e0vbb TIL that the magnetosphere of Jupiter, extends up to seven million kilometers in the Sun's direction and almost to the orbit of Saturn in the opposite direction. If it was visible from Earth, in the night sky, it would be roughly 4 to 5 times bigger than our moon