The first nuclear chain reaction took place at the University of Chicago, under physicists Enrico Fermi and Arthur Compton 

Pu Yi (Hsuan-Tung) became Chinas Last Emperor at age 3 

Carl Goldmark, US inventor of the LP record, is born 

In the US, King Camp Gillette patented a safety razor with a double-edged disposable blade 

Gillette patents 1st disposable razor 

South African president Paul Kruger arrives in Germany 

Gerhardt Mercator, Belgian cartographer, dies