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TIL We Already Have Martian Rocks (Probably)

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MbYa TIL if the Hoover Dam’s 3.25 million cubic yards of concrete was poured all at once, it would have taken 125 years to cool
rx4y TIL The animal that kills the most humans each year is the Mosquito at 725,000 deaths, followed by Humans at 475,000, and then Snakes causing 50,000 deaths per year.
b61P4 TIL in 2006, Steve Wynn sold Picasso's painting La Reve for a $139 million, but before he sent it away, he invited friends over for a last look. While chatting in front of the portrait, he accidentally hit the painting with his elbow, leaving a silver dollar-sized hole and scuttling the deal.
LQVb9 TIL: In 1962, a 10 year old found a radioactive capsule and took it home in his pocket and left it in a kitchen cabinet. He died 38 days later, his pregnant mom died 3 months after that, then his 2 year old sister a month later. The father survived, and only then did authorities found out why.
KYXDR TIL sound travels at 343 m/s in air, 1,481 m/s in water (almost 4.3 times as fast) and at 5,120 m/s in iron (almost 15 times as fast) and in diamond sound travels at 12,000 metres per second (39,000 ft/s),[2]— about 35 times its speed in air because of how exceptionally stiff diamond is.