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TIL A button-up shirt refers to any shirt that buttons up the front. A button-down shirt refers to the collar of a button-up shirt. If the collar can be fastened to the shirt via buttons, then it’s a button-down shirt.

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8mjX TIL scientists believe dolphins can effectively send each other “images” via echolocation by recreating the sound profile an object.
kJ8b4 TIL that In April of 1815, Mount Tambora exploded in a powerful eruption that killed tens of thousands of people on the Indonesian island of Sumbawa. The following year became known as the “year without a summer” when unusually cold, wet conditions swept across Europe and North America.
Mag7 TIL there is a solar power method that doesn’t involve solar panels, but rather a giant curved mirror focusing all of the light that hits it onto a single point of intersection. A water reservoir is placed where the beams of light intersect, and the resulting steam runs a generator.
gMpND TIL in 1998, a married couple was left behind during a diving trip to the Great Barrier Reef. Two days passed before anyone realized what had happened. Despite a 5-day search, the couple was never found. A dive slate was later recovered which read "... rescue us before we die..."
Z875G TIL that between 1974 and 1984 a pro-paedophile activist group called the Paedophile Information Exchange campaigned openly in the UK to abolish the age of consent and even spoke on national television about their views on sexual contact with underage children