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Flying a helicopter on Mars is so damn hard but NASA made it possible. For the first flight, the helicopter took off, climbed to about 10 feet (3 meters) above the ground, hovered in the air briefly, completed a turn, and then landed. It was a major milestone: the very first powered flight in the extremely thin atmosphere of Mars, and, in fact, the first such flight in any world beyond Earth.

Being able to fly a helicopter or drone on Mars is very important as they can cover 24 kilometers in an hour. By the way, Curiosity took nine years to travel less than 25 kilometers.

BgM9W TIL that in 1862 Lincoln rejected an offer for a battalion of elephants from the King of Siam (present day Thailand). The elephants would have been a follow up to a set of "royal gifts" which included a sword "of costly materials" already sent to the president. Talk about a white elephant!
dEmZ TIL: That Maine is the only US state not known to have any ‘dangerously venomous’ spiders.
nWX8b TIL In 2010, to prove the Better Business Bureau was a pay-to-play scam, a group of business owners formed a fictional company called "Hamas" (like the militant group in Palestine). Hamas paid the BBB $425 and received a rating of A minus.
780BP TIL that Tommy Lee Jones hated working with Jim Carrey during the movie Batman Forever (1995). He told Carrey, “I hate you. I really don’t like you,” and when Carrey asked why, he said he cannot sanction Jim Carrey's buffoonery.
0m4L TIL when three men with machetes came into an African orphanage at night, a man named Omari took a hammer to fight all three at once. He survived after getting hit in the face with a machete, and saved all of the children. His story, first shared on Reddit, helped raise $83,000 for the orphanage.