Louis De Broglie was a French physicist born into nobility in 1892. After studying history in college, he became interested in physics and mathematics. During WWI, he served in the wireless telegraphy section of the army in Paris. Influenced by Einstein and Planck's work, in 1924 De Broglie presented his thesis proposing that all particles exhibit wave-like properties, known as wave-particle duality. His theory was proven in 1927 when Davisson and Germer fired electrons at nickel and observed diffraction patterns. De Broglie won the Nobel Prize in Physics in 1929 for this discovery.