Positronium

1932-1951

Positronium

The book of science

Tom Sharp

Carl David Anderson, Stjepan Mohorovičić, Martin Deutsch particle physics

Positronium

Other oniums

Positronia

The study of onia (oniumology?) has helped refine quantum field theory, quantum electrodynamics, quantum chromodynamics, and the theory of strong interactions among fundamental particles.

See also in The book of science:

Readings on wikipedia: