Halflife

no atom knows when. the crowd always does.

random decay, clockwork half-life — pick an atom, fail to predict it

No single atom in the grid can be predicted — you can’t say which one decays next, or when — but the population halves on a fixed, unwavering clock regardless. That gap between individual randomness and collective predictability is what makes radioactive decay usable for dating: you never know which atom is going, but you know exactly what fraction remain after any span of time.

Concepts: radioactive-decay, probability.

An interactive you play with one thumb, on Wundr.