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TIL pitcher plant leaves are an example of convergent evolution, and they evolved independently at least four separate times.

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Jb88 TIL that the Dannebrog, the national flag of Denmark, is the oldest adopted flag still in use by a nation to this date. The flag was adopted in 1219.
b9xaE TIL that Amazon CEO Jeff Bezos and country singer George Strait are cousins.
PnjO TIL the Environmental Protection Agency regulations for tap water are “actually stricter than the Food and Drug Administration regulations for bottled water.”
joLR TIL - “The Blue Marble” is the only whole-earth photo taken by human hands. No one has since been far enough from earth to take a similar picture.
GZX7 TIL that every medicine certified by the FDA must be tested using horseshoe crab blood.