Some cool trivia. Do you have yours?

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I am in the mood listing some cool trivia that I used to know. And then this list comes up: 1) did you know that bats are going to the left when they go outside the cave? 2) did you know that the lightning bolt is 3 times hotter than the sun? 3) did you know that when the queen of a clownfish school dies, a male clownfish changes its gender to become female and takes her place? 4) did you know that sharks are immune to all known diseases? 5) did you know that a group of frogs is called an army, a group of ravens is called a murder and group of officers is called a mess? 6)did you know that Mark Twain was born and Halley's comet was visible in the sky then he died and Halley's comet was once again visible in the sky? The theory of "they came in together, they must go out together" 7) did you know that a duck's quack doesn't echo and nobody knows why? how about you? do you have any?