1877: US inventor Thomas Edison demonstrates his hand-cranked phonograph for the first time

1910: The first US patent for a traffic light system is issued to Chicago engineer Ernest Sirrine [1]

1935: Physicist Erwin Schrödinger publishes his famous thought experiment “Schrödinger’s cat”, a paradox that illustrates the problem of the Copenhagen interpretation of quantum mechanics

1951: Operation Buster-Jangle: First underground atomic explosion at Frenchman Flat, Nevada, codenamed “Uncle”

1953: American Airlines begins the first regular commercial New York to Los Angeles air service

1975: US President Gerald Ford signs the Education for All Handicapped Children Act, requiring states to provide free education for children with disabilities

Source: Οnthisday.com