physics: Beat is the perception of the sum of two close frequencies as one frequency that oscillates between zero intensity and full intensity, caused by the alternating constructive and destructive interference.
... (+ 1944)
March 2 - Dr. Seuss, author (+ 1991)
March 8 - Victor de Kowa[?], actor (+ 1973)
March 6 - Joseph Schmidt[?], tenor (+ 1942)
March 7 - Reinhard Heydrich, ...