The great Richard Feynman was a nobelist, a philosopher and a great teacher. In this video he explains how trees are created from thin air!!
This is not intuitive but it is -of course- absolutely true, and a wonderful example of the difference between learning (that trees get their material from CO2) and understanding (*Air* is transformed in to a living tree). Also a testament of how, the beauty one can see in the cosmos, is enhanced with the better understanding of it….