1905 — Albert Einstein, a German physicist, proposes the special
theory of relativity and the equation E=MC2. In other papers, he
explains Brownian movement and proposes the quantum theory of
light to explain the photoelectric effect. In other news: -
Clarence McClung determines that females have XX sex
chromosomes, while males have XY. - The first Rotary Club is
founded in Chicago. Clubs consist of at least one member of each
business or profession and meetings are held at each member’s
office in rotation. - The number of registered automobiles rises
to 77,988, compared to 300 ten years previously. Cars are still
considered toys by most people.