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TIL there are about 2,200 miles of navigable canals in the United Kingdom requiring many tiny locks to be manually operated and many of them no wider than 7 feet (2.1m). Started for use as commercial transport in the early 19th century it has now turned into a leisure highway of "narrowboats."

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4kM7o TIL about ichneumon wasps, a family of parasitic wasps that lays their eggs in butterfly cocoons, spider nests, or into larger insects directly. The adult wasp paralyzes the hosts such that the ichneumon larvae can feed. After some weeks, the now-mature offspring then emerge en masse from the host
74aM TIL of the “Euthanasia Machine” invented by Philip Nitschke, which asks the patient a series of questions, and automatically administers a lethal injection if the correct answers are made.
MgLK TIL of a recent study that suggests tooth enamel and dentin can be restored while conventional dentistry has believed this to not be possible.
5VlQB TIL that shopping carts were not popular when they were first invented. Men found them to be effeminate and women thought they looked too much like a baby carriage.
0wEGN TIL Cesare Borgia was the illegitimate son of Pope Alexander VI. He was made cardinal after his father's election. Five years later, he would become the first cardinal in history to resign from office.