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TIL axolotl are a population of larval tiger salamanders that mutated the ability to forego metamorphosis when reaching sexual maturity. They retain their larval gills which enable them to live fully aquatically. They are used in labs to study the thyroid, which regulates their maturing.

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xVdZb Balloons are bad for the Earth because they are hazardous to wildlife and can cause outages and fires if they drift into power lines.
KOPww TIL Walgreens found early major success during Prohibition, by filling whiskey prescriptions.
R7BE1 TIL that aside from the destruction of the tea and a padlock, no property was damaged or looted during the 1773 Boston Tea Party protest. The participants reportedly swept before they left.
GARPJ TIL about the Pulsed energy projectile (PAP). A non lethal technology that can could induce cold burn feelings and other forms of painful sensations. Due to public fear of using it aa a torture tool that wouldn't leave any physical evidence, a U.S military program was discontinued.
dDXQK TIL that in a series of experiments in the 1950s, Solomon Asch asked a group of actors and a single test subject what the longest line was in a "vision test". The actors would intentionally answer incorrectly, causing the subject to also answer incorrectly, despite it being very obvious.