Portal:History of science/Selected anniversaries/April 3
- 1529 - Birth of Michael Neander, German mathematician and astronomer (d. 1581)
- 1683 - Birth of Mark Catesby, English naturalist (d. 1749)
- 1693 - Birth of George Edwards, English naturalist (d. 1773)
- 1715 - Birth of William Watson, English physician and scientist (d. 1787)
- 1717 - Death of Jacques Ozanam, French mathematician (b. 1640)
- 1827 - Death of Ernst Chladni, German physicist (b. 1756)
- 1885 - Gottlieb Daimler is granted a German patent for his engine design
- 1932 - Death of Wilhelm Ostwald, German chemist, Nobel Prize laureate (b. 1853)
- 1973 - The first portable cell phone call is made in New York City, United States
- 1998 - Death of Mary Cartwright, English mathematician (b. 1900)