1887
Dec 27
| 1887 • Adolf Gaston Eugen Fick invents the contact lens, made of a type of brown glass. |
1909
Apr 11
Age: 21y
|
marriageMary Winona Plaster Marion County, Oregon, USA ⇓ 1 Source ⇓ |
| 1909 • Karl Landsteiner develops a system of blood grouping. |
1911
Apr 30
Age: 23y
birth of childWilbur Harrison Pettit Portland, Multnomah, Oregon, USA ⇓ |
| 1911 • Mexican Revolution: Pancho Villa launches an attack against government troops in Ciudad Juarez without Madero's permission; the government troops surrender on May 10. |
1961
Jun 28
Age: 73y
| 1961 • South Africa officially leaves the Commonwealth of Nations. |