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TIL the FBI used mail delivery robots in their field offices that navigated the buildings by using cells of black lights to follow an invisible fluorescent paint sprayed onto the carpet to designate its route.

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oBNnL TIL An early purchaser of the Zamboni was worried about profits because people were watching the machine resurface the ice instead of going to the concession stand.
e0ZL6 TIL a Russian lab housing biological weapons and pathogens accidentally released a deadly anthrax strain in 1979, killing an unknown number of people. The lab is still active.
wL8xP TIL if engulfed in flames in a forest fire, some fire trucks can go into burnover mode when a sprinkler system keeps watering the truck (including each tyre) while the fire fighters hide behind heat shields.
neXko TIL that the band Joy Division is named after the group of jewish inmates in concentration camps, that had to fulfill sexual demands of the guards
A6Nn TIL Sylvester Stallone’s uncompromising character John Rambo committed suicide in the original cut of First Blood (1982). This was changed because it was considered too depressing, and the new ending allowed for the later big-budget sequels.