What did john dalton discover?

What did John Dalton discover?

Here's some info: http://en.wikipedia.org/wiki/John_Dalton

He discovered/developed atomic theory, with 5 points:

Five main points of Dalton's Atomic Theory

* Elements are made of tiny particles called atoms
* All atoms of a given element are identical
* The atoms of a given element are different from those of any other element
* Atoms of one element can combine with atoms of other elements to form compounds. A given compound always has the same relative numbers of types of atoms.
* Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process. A chemical reaction simply changes the way atoms are grouped together.