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TIL that the Water Boatman insect uses its penis to make a 99.2 decibel mating call, making it, pound for pound, the loudest creature on Earth.

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xVjg5 TIL That in masonry, a "cornerstone" is the very first stone set as a reference point for all other stones, while a "keystone" in an arch is the very last stone put in place at the top to support the weight of every other stone.
j6V1v TIL the 1927 Nobel Prize in Physiology and Medicine was given to Julius Wagner-Jauregg for curing mental illness by giving patients malaria. (He was, in fact, curing them of syphilis because the malaria fevers are so high that they kill the bacteria. The malaria was subsequently cured with quinine.)
VBkmB TIL that the horned lizard can squirt blood from its eyes as a defensive measure.
d9JK TIL that only one member of Congress voted against the Authorization for Use of Military Force Against Terrorists after 9/11, stating that they should be “careful not to embark on an open-ended war with neither an exit strategy nor a focused target.”
GArl4 TIL: Neil Armstrong’s Spacesuit Was Made by a Bra Manufacturer