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TIL of the Isochrone Curve - a shape with unique properties. If you drop two balls along the curve at different points, they will reach the midpoint at exactly the same time.

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7r9NM TIL children who sucked their thumbs or bit their nails were 33 percent less likely to react to common allergens. By age 32, it is even higher at 39 percent. The reason: Scientists say these kids built immunity to various bacteria at a young age.
0wYJN Today I Learned that Veggietales wasn't originally going to have vegetables as the characters. Phill Vischer simply needed character models that were easy to animate in the early days of computer animation. Vegetables didn’t require animating arms, legs, or hair like humans or animals would.
ANWlw TIL the B-24 'Hot Stuff' was the first heavy bomber to complete 25 missions in Europe during WWII. However, after a crash on the way home killed 14 of the 15 onboard, the USAAF celebrated the B-17 'Memphis Belle' as the first bomber to reach 25 completed missions
oBvgA TIL One of the stated purposes of the US Interstate highway system was to provide access in order to defend the United States during an attack.
gMrr4 TIL that William Henry Harrison only spent a month in office.