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TIL that the Platypus appears to locate prey through a combination of electroreceptors (which sense electric fields) and mechanoreceptors (which sense pressure changes) located in their bill - they even close their eyes, ears, and nose while hunting.

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BrBwD TIL In the Strepsiptera the forewings evolved into halteres while, in the Diptera, the hindwings changed into halteres. Halteres have evolved at least seven times in insects, and in most cases it is known to be associated with improved manoeuvering in flight.
pYaRZ TIL in 1962. An epidemic of laughter broke out in Tanganyika. The outbreak began in a girls' school and then spread to other communities, where uncontrollable laughter affected an estimated 1,000 people. It lasted several months and 14 schools in the district were closed for quarantine.
LQMem TIL the Manchineel Tree, is one of the most toxic trees in the world. Contact with its sap can cause blisters, and damage paint on cars. Ingestion of the fruit can cause severe gastroenteritis with bleeding, shock, bacterial superinfection, and compromise airways due to edema.
GAke7 TIL that a Steam Engine Train brought down a Focke-Wulf Fw 190 during WWII
J1nG1 TIL Your brain is eating itself all the time