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TIL on Halloween 1992, a BBC mock documentary "Ghostwatch" was mistaken for a real one amongst most of its 11 million UK viewers (receiving 20,000 complaints about its scary content), and was never broadcast again after that experience

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JYZvl TIL that grain-free dog/cat food, although advertised as more healthy, has been linked to deadly heart issues in dogs/cats and most vets recommend against it.
Bro9L TIL A car ride to the nearest star at 70 miles per hour would last over 356 billion years.
VBn7m TIL that the male redback spider will assist his partner during sexual cannibalism by somersaulting toward her mouthparts. Because this allows him to mate only once, some find a juvenile female -- too young to eat him -- and break her exoskeleton to deliver his sperm for her to use when mature.
J1r4B TIL Warsaw, Poland uses 8 clams to detect the purity of the drinking water. If 6 or more clams suddenly close their shells for at least 4 minutes, it sets off an alarm that toxins have been detected.
e0DXn TIL: As a person quits smoking, residue comes off their lungs and up their nose which now has a heightened sense of smell causing vivid, realistic dreams of smoking