Finally, steady beats scale beyond the individual. The eradication of smallpox in 1977 did not hinge on a single miracle but on sustained, methodical vaccination and surveillance—often “ring vaccination”—coordinated over years (Fenner et al., 1988). Just as Keller’s breakthrough emerged from daily practice, public health victories arrive through disciplined routines that accumulate into historical turning points. The same logic that reshapes a life can, with enough steady heartbeats, reshape the world. [...]
