A scientific theory is an explanation of an aspect of the natural world that can be or that has been repeatedly tested and has corroborating evidence in accordance with the scientific method, using ac
The first observation of cells, by Robert Hooke, using an early microscope. This led to the development of cell theory.
Sir Karl Raimund Popper was an Austrian–British philosopher, academic and social commentator. One of the 20th century's most influential philosophers of science, Popper is known for his rejection of t
Popper in the 1980s
Popper bust in the Arkadenhof of the University of Vienna
English Heritage blue plaque at Burlington Rise, Oakleigh Park, London
Popper's gravesite in Lainzer Friedhof [de] in Vienna, Austria