If you want to become one of those people who always have some amazing random fact to share and impress everyone else, this collection of facts about the world is for you. Just 20% of laughter is caused by jokes and funny situations. Humans are just one of the world's 8.7 million estimated species. An apple is almost 20% air: that's why it floats when placed in the water. Pluto was discovered in 1930 and lost its planetary status in 2006. How many of these facts did you know?

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