Science and Society Class Project By ERayhel Aug 29, 1514 Copernicus proposes a Heliocentric solar system Aug 29, 1600 Gilbert discovers magnetic core of the Earth Mar 19, 1611 Galileo Galilei publishes SIDERIUS NUNCIUS (Starry Messenger) In Siderius Nuncius, Galileo describes the phases of venus, which indicated that venus was orbiting the Sun, not Earth. Aug 29, 1664 Newton propses law of gravity Aug 29, 1665 Discovery of the first cell by Robert Hooke Point added by Justin Rujawitz Aug 29, 1668 spontaneous generation disproven Aug 29, 1670 bacteria observed by van Leeuwenhoek Aug 29, 1676 Romer measures the speed of light Aug 29, 1751 Franklin discovers that electricity is fluid Aug 29, 1781 Uranus observed Aug 29, 1800 Electric flow discovered by Volta Aug 29, 1824 properties of cement discovered by Aspdin Aug 29, 1842 Doppler effect discovered by Christian Doppler Aug 29, 1846 Discovery of anaesthesia by William Morton Aug 29, 1849 link between Cholera and water source discovered by John Snow Aug 29, 1865 Dominant and recessive traits proposed by Gregor Mendel Aug 29, 1866 properties of dynamite discovered by Nobel Aug 29, 1869 Period Table Developed by Dmitri Mendeleev Aug 29, 1879 Carbon filament for incandescent lightbulb discovered by Edison Aug 29, 1895 Discovery of xrays by Wilhelm Roentgen Aug 29, 1896 Becquerel discovers that uranium is radioactive Aug 29, 1899 Aspirin purified by Felix Hoffman Sep 26, 1905 Einstein publishes the Theory of Relativity Aug 29, 1922 Atomic structure understood by Bohr Aug 29, 1928 Penecillin effect discovered Aug 29, 1942 discovery of atomic chain reactions by Oppenheimer Aug 29, 1953 Watson and Crick propose structure of DNA Aug 29, 1955 Jonas Salk develops polio vaccine Aug 29, 1972 Development of the computer language C