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TIL that Pilot FriXion ink is thermo-sensitive, and leave a notebook or homework near heaters or in a car on a hot day can make the ink invisible. To make the text reappear, you can simply put it in a freezer for a short period of time, the ink should reappear at around -10C/14F

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PYZvZ TIL One of the first recorded applications for a closed circuit television system (CCTV) was back in 1942 in Nazi Germany, where it was used to monitor the launch of V2 rockets.
e0RbJ TIL Sherlock Holmes' address, 221B Baker Street, was originally fictional, as Baker Street's numbering didn't go that high. However, street numbers were reallocated in the 1930s, and the building that got Holmes' address had to get a "secretary to Sherlock Holmes" to deal with it.
jpEa TIL that The Pokemon Company has registered over 700 domains for each type of Pokemon that, when a Pokemon’s name is typed in as a url, they will be brought to the official Pokedex entry for the Pokemon they entered as the url.
dX0d TIL that the Eagles football team had a temporary court set up in their stadium for six years due to their fans bad behavior.
vQoB TIL there was a group of raider colonies in ancient Egypt who terrorized the Mediterranian coast, that has gone relatively unidentified to this day. The are collectively known as the Sea Peoples, and according to Ramesses II, no one knew how to fight against them or could withstand them.