Births on January 1

Calum MacKay, Canadian ice hockey player (d. 2001)

Calum "Baldy" MacKay (January 1, 1927 – August 21, 2001) was a Canadian professional ice hockey player. He was born in Toronto, Ontario.

10 Jan

Metropolis (1927 film)
Fritz Lang's futuristic film Metropolis is released in Germany.
23 Feb

Uncertainty principle
German theoretical physicist Werner Heisenberg writes a letter to fellow physicist Wolfgang Pauli, in which he describes his uncertainty principle for the first time.
30 Apr

Mary Pickford
Douglas Fairbanks and Mary Pickford become the first celebrities to leave their footprints in concrete at Grauman's Chinese Theater in Hollywood.
27 May

Ford Model T
The Ford Motor Company ceases manufacture of the Ford Model T and begins to retool plants to make the Ford Model A.
26 Jun

Coney Island
The Cyclone roller coaster opens on Coney Island.