n Two revolutions in physics in early part of 20th century (1900s)

        Ø Einstein's theory of relativity

                Work of one person: Einstein

        Ø Quantum theory

                Work of many: Including Planck, Schrodinger, Heisenberg

n Experiments: From Cathode Rays to Electrons - 1800s

Discharge Tube	Electric and Magnetic Fields Applied - Resulted in Deflections of the Particles