A collection of some 25,000 historical photographs, slides, lithographs, engravings, and other visual materials, focusing on American physicists and astronomers of the twentieth century, but including many scientists in...

This website from the University of Virginia provides an overview of the advancements in chemistry and physics that led to the atomic model of matter. The ideas of Galileo, Dalton, Gay-Lussac, Avogadro, and others are...