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The first steam locomotive.
In 1803 Richard Trevithick built the first steam locomotive. -
Brownian motion
In 1827 Robert Brown discovered "Brownian motion". -
Theory of evolution.
In 1859 Charles Darwin published the theory of evolution. -
Electromagnetic theory.
In 1873, James Maxwell created the electromagnetic theory, which united the previously disparate information about light, electricity, magnetic phenomena. -
The discovery of the electron.
In 1897 Joseph Thomson discovered the electron. -
The discovery of the neutron
In 1932 James Chadwick discovered the neutron - a neutral particle that came along with the protons in the nucleus of an atom and has played such an important role in creating ways of using nuclear energy.