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TIL When humans and dogs gaze into each other’s eyes both of their brains can excrete oxytocin, the only observed case between two different species

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oBOxA TIL that Thomas Jefferson brought Macaroni & Cheese to America
R7kJQ TIL: Trapped behind enemy lines during the Korean War Chester Puller Stated, "We’ve been looking for the enemy for several days now. We’ve finally found them. We’re surrounded. That simplifies our problem of finding these people and killing them." He and his men survived.
Og8L TIL that the Automotive Crash Injury Research Center originally used corpses rather than dummies when crash-testing cars
err6 TIL: Hitler was a creepy uncle to his Niece Geli Raubal, forbidding her to marry, having her accompanied everywhere and practically keeping her prisoner until she committed suicide in 1931, after which Hitler called her “The only woman he ever loved”
7robM TIL that the function of coupon codes is to increase the posted price to profit from price-insensitive buyers, while still maintaining an attractive price for price-sensitive buyers willing to use coupons.