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Gravitational waves — ripples in the fabric of space-time — are a big deal in the world of science. Here's a video that helps explain how they work.

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pwke TIL that round goldfish bowls are banned in Monza (Italy), because ‘a fish kept in a bowl has a distorted view of reality’.
KOWXa TIL that Thomas-Alexandre Dumas, one of the highest-ranking men of African descent ever to lead a European army, has a verbal clashed with Napoleon Bonaparte.
0dvVN TIL of the HMS Royal George, the largest warship in the world at the time of her launch in 1756. Her sinking near Portsmouth killed more than 800 people, making it one of the most deadly maritime disasters in British territorial waters. Many who died were women and children, visiting family onboard.
Lxvp TIL there is an organization called Engineers Without Borders that works to improve infrastructure and engineering practices in developing countries.
790L TIL Stockholm, Sweden tested a “Speed Camera Lottery” where speed limit-abiding drivers were automatically entered into a drawing to win a prize pool funded out of fines paid by speeders.