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TIL the marsh mallow was a delicacy in ancient Rome and Egypt. By the 1800s, confectioners were making small batches of candy with mallow, sugar, and egg whites. Mass production was made possible by using gelatin and corn starch instead.

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R5Vda TIL when you experience excitement, your thoughts trigger the pituitary gland to tell the adrenal glands to release adrenaline. This pulls blood to your lungs and muscles (to activate your fight-or-flight response) and away from your stomach. Boom! There are your butterflies.
b6Rdj TIL when Freud developed the concepts of the id, ego, and superego in psychology, the original German words he used literally meant "The it, I, and over-I". Id, ego, and superego were the words chosen by English translators
5Qm8 TIL that D.A.R.E., the education program that seeks to prevent use of controlled drugs, has been deemed “ineffective” repeatedly in multiple studies.
PL7g TIL that women generally had more legal rights under Islamic law than they did under Western legal systems until more recent times
0d7py TIL about the Vipeholm experiments, a series of human experiments where patients of Vipeholm Hospital for the intellectually disabled in Lund, Sweden, were fed large amounts of sweets, including "extra sticky toffee" to provoke dental caries.