Portal:History of science/Selected anniversaries/September 4
- 1784 - Death of César-François Cassini de Thury, French astronomer (b. 1714)
- 1852 - Death of William MacGillivray, Scottish naturalist and ornithologist (b. 1796)
- 1888 - George Eastman registers the trademark Kodak and receives a patent for his camera that uses roll film
- 1906 - Birth of Max Delbrück, German biologist, Nobel laureate (d. 1981)
- 1913 - Birth of Stanford Moore, American chemist, Nobel laureate (d. 1982)
- 1977 - Death of Jean Rostand, French biologist (b. 1894)
- 2006 - Death of Steve Irwin, Australian naturalist and television personality (b. 1962)