British philosopher (born in Austria) who argued that scientific theories can never be proved to be true, but are tested by attempts to falsify them (1902-1994).

synonyms: Karl Popper, Sir Karl Raimund Popper.

Polish: Popper, Sir Karl Raimund Popper, Karl Popper

A container of stimulant drug (amyl nitrate or butyl nitrite).

A container for cooking popcorn.