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TIL that bleach solutions used for killing viruses degrade quickly, and should be replaced every 24 hours.

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ERlX TIL the name ‘Tank’ for armoured vehicles originated as a code word describing the vehicles as water carriers (or water tanks), to confuse enemy spies and keep their creation hidden. Water carries wasn’t used as this would have been abbreviated to W.C, another name for toilets.
Z8rxv TIL the 1.5-mile-long, 22-foot-high, 4.5-foot-wide granite wall, that currently surrounds the Minnesota State Correctional Facility in St.Cloud, Minnesota, USA is the second largest wall built using inmate labor in the world. The Great Wall of China is the first.
a8xL9 TIL The US Census has noted that the only two years where the US resident population has shrunk were 1918 and 1944. However overall American population growth was positive in those years when overseas armed forces are included.
GAROG TIL that Thanksgiving is the most popular single day for Chinese immigrants in NYC to get married, as it is generally the only day on which entire families will not be at work. Restaurants have to be booked a year in advance, with as many as 10 receptions hosted in a single day.
nepDb TIL That due to some missing paperwork, Ohio wasn't legally a state until 1953. 150 years after the Ohio constitution was presented to congress.