In biology, particularly cell biology, the term organelle is used to describe any one of a number of types of subcellular structures, historically identified through the use of some form of microscopy.
A few large organelles probably originated from endosymbiont bacteria:
... 1904 in sports
The second Summer Olympic Games are held in St. Louis, Missouri, USA
Births:
January 5 - Jeane Dixon[?], astrologer (+ 1997)
January 10 - Ray Bolger, ...