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TIL Morphogenesis, the math behind for example a giraffes spots or a zebras stripes. This theory coined by Turing found that these apparently random patterns have a mathematic order.

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mwWx TIL of a new buiding material - mushroom mycelium - that is stronger than concrete and water-, mold- and fire-resistant. It generates no waste and takes nearly no energy. The Museum of Modern Art has a 40ft. tower of fungus bricks designed to provide cool air and shade to customers.
6EwnY TIL that the rate of colorectal cancer has been rising in young adults in the US and no single factor has been identified for this trend.
8e0Qa TIL: There existed elephant duels in SE Asia. Opposing army leaders of equal status would face each other on the battlefield in single combat atop elephants. It was seen as honorable and heroic as it avoided troop losses. The practice died when the Portuguese introduced guns in the 16th century.
XQKr TIL the average male has 5 erections per night (while sleeping) and they last anywhere from 20-30 minutes.
VMnjk TIL that by 400 BC, Persian engineers had mastered the technique of storing ice in the middle of summer in the desert