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TIL that a whale’s ear wax builds up over the course of its life and can be analysed like tree-rings.

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GYBNN TIL that writer Isaac Asimov and Star Trek creator Gene Rodenberry died with six months of each other. Asimov helped saved Star Trek from cancellation by writing a fan letter to TV Guide saying it was a "fresh and intellectually challenging science fiction television show". His daughter was a fan.
KOeP6 TIL there is an organisation responsible for maintaining global time standards, and they occasionally apply a "leap second" to Universal Standard Time
60lQ TIL when a high school in Pennsylvania issued MacBooks to its students, they remotely activated the webcams to take automatic photos of the students every 15 minutes. They took over 56,000 webcam shots before getting busted. They were sued for $610,000.
px1Z TIL in 1987, North Korea brought down a South Korean jet on its way to Seoul from Baghdad. NK’s agent was posing as a Japanese national, having been taught Japanese language and customs for 3 years by a Japanese woman who was abducted from her home in Northern Japan
E145o TIL that the human body literally emits light (like fireflies do), but 1/1000 times the sensitivity of naked eyes.The light emission is rhythmatic and peaks at 4 pm.