Where Do Trees Get Their Mass?
Veritasium · 3 HN recommendations
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Veritasium asks people where a tree's mass comes from, then explains that most of a dry tree's mass originates from carbon dioxide in the air. It combines street interviews with a short explanation of photosynthesis.
Why HN recommends it: HN uses it as the go-to demonstration of how unintuitive mass conservation is, especially in weight loss and burning threads.
“Veritasium has a fun video demonstrating how unintuitive this is” Read on HN ↗