Parents
Spouse
Siblings
1887
Dec 21
| 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. |
1900
Jun 5
Age: 12y
| 1900 • U.S. Secretary of State John Hay announces the Open Door Policy to promote American trade with China. |
1969
Mar 2
Age: 81y
| 1969 • Sesame Street is broadcast for the first time, on the National Educational Television (NET) network. |