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TIL Siskel and Ebert reviewed Debbie Does Dallas

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NkV1 TIL a simple equation called Dawes Formula is very accurate at predicting success of marriages - “frequency of lovemaking minus frequency of quarrels”. A positive difference predicts marital happiness, a negative one unhappiness.
LkMEd TIL Ninjas didn't actually wear black masks. The black mask associated with ninjas is actually an amalgamation of how a thief dressed in Japan. Ninjas also didn't use shuriken Throwing stars), they were used by Samurai swordsmen.
loQ81 TIL "Drinking Birds" usually require the cup of water, meaning that they can't be used to repeatedly press something, as often shown in media.
vpAR TIL Acme City whistle founder Joseph Hudson accidentally dropped his violin and it shattered on the floor. As the violin broke, it emitted a unique warbling sound and led him to an idea to putting a pea in a whistle. Pea whistles went on to replace policemen’s ineffective rattles for communicating.
LQj6r TIL high testosterone can result in a weakened immune system. This is why men usually are hit harder by colds than women