Richard Fenyman - Biology Of A Tree

"People look at a tree and think it comes out of the ground, that plants grow out of the ground, but if you ask, where does the substance [of the tree] come from? You find out ... trees come out of the air!"

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Where do trees come from? The instinctive answer would be from the soil below, plus a little water and sunshine. Not so, says Nobel Prize winner Richard Feynman.