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TIL: About 95% of serotonin is produced in the gastrointestinal tract which is lined with a hundred million nerve cells, or neurons, that are influenced by bacteria. The inner workings of the digestive system don’t just help digest food, but also guide moods and emotions.

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awV8A TIL of Machine Identification Code (MIC), a pattern of yellow dots color printers add to their output that has metadata about the printer, the document and the operator. Its existence was secret for more than 15 years.
LklZp TIL that in 1958 the Soviets reached one of the most remote places in Antarctica where they built a cabin. When they left they placed a bust of Lenin on top of the chimney facing in the direction of Moscow, which today is now the only thing standing above the snow
xVMlo TIL of Hilberts Hotel. It can accomodate any number of new arrivals, even when it is already fully occupied. Surprisingly, it can even accomodate an infinite number of new arrivals, when already full. In both cases however, all guests must move to a different room.
mxx9P TIL There are four different types of OCD. One of them is checking. The checking is often carried out multiple times, sometimes hundreds of times, and for hours on end, resulting in the person being late for work, dates and other appointments.
N7wgE TIL baby Sanddollars (like a sea urchin) eat the heaviest bits of sand they can find, to weigh them down so they don't get swept away, like a teeny tiny weight belt