April 15, 1874 - German physicist Johannes Stark is born. Stark's work in discovering the doppler effect in canal rays and splitting of spectral lines in electric fields (known as the Stark effect) earned him the 1919 Nobel Prize in Physics.
April 15, 1892 - The General Electric Company is formed. In the years since, GE carries out research which results in several technological and scientific advances.
Apr. 20, 1902 - Pierre & Marie Curie refine radium chloride.
Apr. 19, 1906 - French physicist Pierre Curie dies. Curie won the 1903 Nobel Prize in Physics for his work, along with his wife Marie Curie, in studying radioactivity.
Apr. 20, 1918 - Swedish physicist Kai Manne Borje Siegbahn is born. He earned the 1981 Nobel Prize in Physics (with Nicolaas Bloembergen and Arthur Schawlow) for their work in spectroscopy.
Apr. 20, 1927 - Swiss physicist Karl Alexander Muller is born. Muller received the 1987 Nobel Prize in Physics for work in superconductivity in ceramic materials.
Apr. 17, 1942 - French physicist Jean Baptiste Perrin dies. Perrin did extensive experimental work which helped to prove that matter was made of atoms, including work in confirming Einstein's theory explaining Brownian motion. This work eventually earned him the 1926 Nobel Prize in Physics.
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