1801 - Thomas Young performed the double-slit experiment demonstrating the wave-particle duality of light.
In 1808 John Dalton described the atomic theory based on modernphysical science.
1820 - Hans Christian Orsted discovers the connection between electricity and magnetism.
1843 - James Prescott Joule measures the equivalence between mechanical work and heat,resulting in the formulation of the law of conservation of energy.
1845 - Christian Doppler demonstrates the effect that bears his name (Doppler effect).
1851 - Léon Foucault, using a pendulumdemonstrates the rotation of the Earth.
1859 - Charles Darwin publishes The Origin of Species.
1861 - Louis Pasteur conclusively disproves the theory of spontaneous generation.
1863 - Gregor Mendel beganstudying the laws of genetic inheritance.
1869 - Dmitri Mendeleev describes the periodic table of chemical elements.
1873 - James Clerk Maxwell formulated the classical laws of electromagnetism.
1877- Ludwig Boltzmann entropy defined statistically.
1887 - The Michelson-Morley experiment refutes the theory of luminiferous ether and provides the experimental basis of special relativity.
1896 -Henri Becquerel discovered radioactivity.
1897 - Joseph John Thomson discovers the electron.
1905 - Albert Einstein publishes his theory of special relativity.
1911 - Ernest Rutherford providesthe experimental basis of the atomic theory of matter.
1911 - Onnes: Getting Started with Superconductivity.
1913 - Niels Bohr presents his model of the atom.
1915 - Einstein publishes the theoryof general relativity.
1919 - Arthur Eddington demonstrates the theory of general relativity by measuring the sun's gravitational effect on light from distant stars.
1920 - Otto Stern and WalterGerlach performed the experiment of Stern and Gerlach, which demonstrates the existence of the spin of subatomic particles.
1920 - John B. Watson and Rosalie Rayner.
1927 - Georges Lemaître proposes...