Trees are among the most extreme and successful forms of life on Earth. They build their bodies from thin air, move water with pressures that would crush a human, and grow using a fascinating system of living cables wrapped in layers of corpses. Under their bark lies a razor-thin strip of living cells, working endlessly to move water hundreds of meters, build indestructible wood, and coordinate millions of functions. How do trees work, and what are they even made of? What makes these ancient giants so resilient, and maybe even immortal?