HackerTube / Video
Where Do Trees Get Their Mass?
Veritasium
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.
HN uses it as the go-to demonstration of how unintuitive mass conservation is, especially in weight loss and burning threads.
4 Hacker News mentions · 2015–2021