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General Chemistry

Bonds, reactions and energy. The layer between physics and everything that is alive.

Essays

How ultraviolet burns youSunlight never ionizes anything in you. How a 4 electron volt photon excites a thymine, staples it to its neighbour in a picosecond, and what the cell does about it. Excite or ionize on a ladder; a strand of DNA under a lamp with the ozone layer, a window or sunscreen in the way.October 2026 · 2 interactive figures