Try Seed Lab free in your browser, with nothing to install and no account. Plant a bean in a pot with a glass front and watch it grow, day by day: the root goes down first, a hook pushes up through the soil, and the leaves turn toward the window. Change the light, the water, the warmth and how deep you plant it. The ledger keeps the books on every gram of the plant: most of it came from the air, a little from water, and only a few grams in every hundred from the soil.