Trees are some of the most remarkable and successful living things on Earth.
They create most of their bodies from the air, move water with forces strong enough to crush a person, and grow using a network of living tubes wrapped in layers of dead wood.
Beneath the bark is a thin layer of living cells that never stops working — pulling water up to great heights, building strong wood, and performing countless functions at once.
So how do trees actually work, and what are they made of? What gives these ancient giants their incredible toughness — and even the possibility of living forever?
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