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TIL that actor Jason Mantzoukas (Dennis Feinstein in Parks & Rec) has a life threatening allergy to eggs. Even a trace amount of egg will cause him to have a severe reaction. Once, while on set, he had to be taken to the hospital because of undisclosed egg whites in a parfait he ate.

ADa7n TIL Tears in your eyes often drain through small drain ways called "punctum" near the middle of your lower eyelid. They then drain into your nose, contributing to runny noses. When you choke on food, your eyes water because nasal pressure is reversed sending tears back to your eyes the same way.
xVRx7 TIL Isaac Newton poked his eye with a sewing needle to learn more about light by seeing how altering the shape of his eye would change his perception - he recorded seeing colored circles and other visual phenomena.
ADxXo TIL of the Talheim Death Pit, a mass grave dating to 5000BC, containing the remains of 34 bodies, bearing some of the earliest evidence of habitual warfare, including fatal adze, axe and arrow wounds to the back of the head. It has been suggested that this site represents an early form of genocide.
OodkX TIL that Komodo Dragons are in fact venomous. For decades it was believed that their bite was dangerous because of toxic bacteria in their mouths.
8aQ7X TIL that Czechoslovakian car company, Tatra, sued Ferdinand Porsche for patent infringement, due to similarity in design between the VW Beetle and the Tatra V570. Hitler said he would "solve his problem," subsequently invading Czechoslovakia in 1938. The lawsuit was dropped soon after.