A science writer explores chaotic phenomena and deterministic systems that produce random-like behavior, discussing the Lorenz water wheel, the distinction between genuine quantum indeterminacy and classical chaos, and plans for tabletop experiments to observe complex dynamics like convection plumes.
A critical period is a biologically timed developmental window when an organism must receive specific experience for skills like language, vision, and social bonding to develop normally; missing this window makes acquiring the skill difficult or impossible later. The concept originated from embryology studies and imprinting research, where brain plasticity enables rapid learning before maturation of inhibitory circuits closes the window.