Parents
Siblings
1887
Apr 22
| 1887 • Heinrich Hertz discovers the photoelectric effect on the production and reception of electromagnetic (EM) waves (radio). This was an important step towards the understanding of the quantum nature of light. |
before
Age: 12y
1900
Age: 12y
| 1900 • American temperance agitator Carrie Nation begins her crusade to demolish saloons. |