Wooden spheres used by Dalton are 1st known models of atoms
Born on September 6, 1766, British scientist John Dalton, who pioneered the modern atomic theory, imagined atoms as solid spheres. Dalton then used a set of wooden balls for teaching in 1810, the first known models of atoms. Moreover, being colour blind, he was the first to write a scientific paper on the condition, sometimes called 'Daltonism' in his honour.