1943 introductions

theory in developmental psychology proposed by Abraham Maslow, comprising a five-tier model of human needs: physiological, safety, love and belonging, esteem, and self-actualization

thumbnail|Commemorative Swiss coin showing the modulor. The Modulor is an anthropometric scale of proportions devised by the Swiss-born French architect Le Corbusier (1887–1965).

map projection

thumb|Classic twin-hose Cousteau-type aqualung Aqua-Lung was the first open-circuit, self-contained underwater breathing apparatus (or "scuba") to achieve worldwide popularity and commercial success. This class of equipment is now commonly referred to as a twin-hose diving regulator, or demand valve. The Aqua-Lung was invented in France during the winter of 1942–1943 by two Frenchmen: engineer Émile Gagnan and Jacques Cousteau, who was a Naval Lieutenant (). It allowed Cousteau and Gagnan to film and explore underwater more easily.

tactic of the German Air Force against British night bombers