Bacteria swim at random and leak a signal that diffuses and decays. A cell sensing the signal above threshold switches on, glows and leaks 10× more.
Tap to add 40 bacteria. The same ?seed= always gives the same run.
LITQuorum sensing (Vibrio fischeri; Nealson & Hastings). The signal must stay non-negative and finite, or the page throws.
AMBERThresholds are made up.