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TIL eye contact helps people determine trustworthiness of others, through pupil mimicry and the release of oxytocin when eye contact is made.

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EAAw TIL flamethrowers could only fire for about 7 seconds before running out of fuel.
kJWe4 TIL that a May 2024 study revealed the human brain now contains an average of 0.5% plastic by weight. This is 50% more than an equivalent study from 2016.
OQoR TIL that every single ruler of Germany (AKA East Francia or the Holy Roman Empire), from Charlemagne to Kaiser Wilhelm II, is part of a contiguous family tree. Even if it’s occasionally through marriage, that’s over 1,000 years.
YpVGd TIL a memorial to faithful slaves was installed in 1900 in Fort Mill, SC.
LkLod TIL Canadian Prime Minister Sir John A. Macdonald was adamantly opposed to state regulation of firearms even though many in his own party worried about the proliferation of cheap, easily concealable handguns. He believed the right to carry weapons was an important component of British liberty