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TIL humans have invisible “stripes” in their skin that are only visible due to certain skin diseases. The patterns that these “stripes” form are thought to be the migration patterns of embryonic cells.

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YXxx TIL that early balloons were made from animal intestines.
RDP7 TIL the word ‘you’ was once used only for two or more people, and 'thee’, 'thou’, 'thy’ etc referred to just one person.
POyL TIL in 2011, instead of taking steps to alleviate their drought problems, the state of Texas decided to call for 3 days of prayer, after which their drought became much more severe.
WBeN TIL the pages of what became Catcher in the Rye were carried by author J.D. Salinger as he stormed the beach at Normandy on D-Day, through the streets of Paris, and into liberated concentration camps. The story was shaped by his experiences.
oBLOW TIL sandplay therapy, the playing with sand & objects in a tray, can facilitate a healing process as the unconscious expresses itself in the sand & influences the sand player. The effectiveness of play therapy is comparable to that of psychotherapy