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TIL there is a condition called Aphantasia, where a person is unable to conjure up visual images in their imagination. When they close their eyes and think of an object, there is no visual imagery of the object - instead they imagine concepts that would describe the object.

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69Pxl TIL of the Mad Gasser of Mattoon - an individual dressed in black that was believed to be responsible for gas attacks in Mattoon, Illinois during the 1940s. Despite claims and eye witnesses many have written it off as a mass hysteria event or one caused by the inhalation of pollutants/substances.
BrjK TIL that Google Earth was originally called Earth Viewer and was created by Keyhole, Inc., a company who were partially funded by the CIA via venture capital firm In-Q-Tel that invests in high-tech companies for the sole purpose of keeping the CIA equipped with the latest in information technology.
1y94 TIL that Sylvester Stallone sold his dog for $25 to make ends meet before hitting it big with Rocky, then bought it back for $15,000.
loVb1 TIL Bones produce piezoelectricity when stress is applied and forms electrical dipoles that attract osteoblasts. Osteoblasts deposit calcium and other minerals on the part of the bone that is stressed which increases the density of the bone.
klyW TIL Commercial flights were allowed to fly any course to their destination and would often detour over points of interest. This ended in 1956 when two planes crashed mid-flight over the Grand Canyon.