Dr Lara Wegener MD on Instagram: "Mind-blowing: Richard Feynman explains how air, not earth, is the primary source of trees and how the sun’s light and heat energize a log fire. What feels counterintuitive is precise physics and chemistry. About 95% of a tree’s dry mass comes from carbon dioxide in the air, not soil. Through photosynthesis, powered by sunlight, trees transform CO₂ and water into wood. Soil contributes mainly minerals typically less than 5% of total biomass. A 100-ton tree gains