The life of a civilization as described by Sir John Bagot Glubb ('Glubb Pasha') as explained in 'Immoderate Greatness' by William Ophuls.

The dynamics of a moose population with density-dependent birth rate...the birth rate equals the death rate when the population is at carrying capacity; the birth rate is greater than the death rate when the population is below carrying capacity; the birth rate is below the death rate when the population is above carrying capacity.

The dynamics of a moose population with  birth and death rates that are the same year in and year out.

The dynamics of a moose population with  birth and death rates that vary year to year depending on factors like food supply, predators, and random chance.

Illustrative early-stage rumor model for a social feedback assignment. Active sharers start at 10. New sharers = 0.3 * [Active sharers] per day. More sharers generate more recruits, who become sharers: reinforcing loop R1. Run 10 days with a 0.1-day Euler step. This assumes a large reachable audience, no repeat recruitment, and no departures. Change 0.3 to 0 to represent completely interrupted recruitment. Values are hypothetical, not a forecast. Audience saturation, credible corrections, and reduced forwarding can weaken the loop.

Excessive screen time increases parental monitoring and grounding, which reduces screen time and restores behavior.