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TIL of HEXAGON, a spy satellite used by the USA during the 1960s that captured several miles of film at a time, airdropping them into the ocean for recovery

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1A1P TIL that it is literally impossible for our brains to multi-task; when we think we’re multi-tasking, we’re actually context-switching, which is quickly switching back-and-forth between different tasks, rather than doing them at the same time.
E1xJ0 TIL that the "worst disaster" in British Military History was the Battle of Singapore, when the British had their sea guns the wrong way, expecting Japan to invade by sea as the jungles of Malaya were impenetrable. Instead they landed and invaded on bicycle, catching everyone off guard.
woNKM TIL in 2016, Mozart sold more CDs than Beyoncé. This was due to the release of a box set commemorating the 225th anniversary of Mozart’s death including 200 discs per set. Each disc counted as a separate sale, propelling Mozart ahead of contemporary artists in CD sales the year.
nelZo TIL why coins have ridges on the sides... Criminals in the 1700s saw they could make a good profit by filing shavings from the sides of gold and silver coins. Today’s coins contain no precious metals but, you’ll still find those ridges to make them distinguishable for visually impaired people.
J1rZ8 TIL that each 1 step on the moment magnitude earthquake scale is 10^1.5 ≈ 31.62 times apart energetically, and thus every 2 steps are 10^3 = 1,000 apart while each fraction of a step is 10^(1.5*fraction) apart, e.g. a 5.4 earthquake is 10^0.6 ≈ 3.98 times more energetic than a 5.0 earthquake.