There are many questions that might seem simple but aren’t. For instance, where does the mass of trees come from?

Many people believe it comes from the soil. However, most of a tree’s mass comes from carbon… in the air.

This is one of those tidbits of information that if you know it, it’s not a big deal, but if you don’t, well then you likely either checked the date of this post to see if it was written on April Fools, or you did a Google search.

While it is interesting to dig into the science of this and learn about photosynthesis, and study the exchange of gasses, and what happens to carbon in the process, it’s also wonderful to marvel at the idea of what’s happening: Trees grow and get their size out of the air.

Here’s a quick video that explains it.

Here is another thought about trees. They won’t grow without the energy of the sun doing the work to convert the carbon from the air into the mass of the tree… so when you throw a log into a fire, you are converting energy captured by the sun back into heat energy.

From Wikipedia:

In physics, mass–energy equivalence is the principle that anything having mass has an equivalent amount of energy and vice versa, with these fundamental quantities directly relating to one another by Albert Einstein’s famous formula:

This is a big jump in thinking, but isn’t it interesting that so much of the mystery of life and our universe can be derived from the mass of a tree?

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* Update: See the first comment by Stephen Downes that points out my error in connecting the relationship to the mass-energy equivalent… I should have just left this post at the marvel of trees growing out of air!