In chemistry, a suspension is a mixture in which a finely-divided solidphase is combined with a liquid phase, with the solid being so finely divided and mixed that it doesn't rapidly settle out.
... dancer (+ 1979)
April 7 - Ralph Bunche[?], diplomat, winner of the Nobel Peace Prize
April 16 - Fifi D'Orsay, actress (+ 1983)
April 22 - Robert Oppenheimer, ...