January 1931

january – national committee modification of volstead act formed work repeal of prohibition in united states.
january 2 – south dakota native ernest lawrence invents cyclotron, used accelerate particles study nuclear physics.
january 3 – albert einstein begins doing research @ california institute of technology, along astronomer edwin hubble.
january 4 – german pilot elly beinhorn begins flight africa.
january 6 – thomas edison submits last patent application.
january 22 – sir isaac isaacs sworn in first australian-born governor-general of australia.
january 25 – mohandas gandhi again released imprisonment in india.
january 27 – pierre laval forms government in france.
january 30 – release of movie city lights starring charlie chaplin.