1928 CE

The discovery of penicillin by Alexander Fleming revolutionizes medicine as the first true antibiotic; the Kellogg–Briand Pact sees major powers renounce war as national policy, reflecting interwar idealism; the 1928 Summer Olympics in Amsterdam mark the first women’s track and field events; the Huanggutun incident assassinates warlord Zhang Zuolin, aiding Nationalist consolidation in China; the 1928 Okeechobee hurricane kills thousands in Florida and the Caribbean; and Steamboat Willie debuts Mickey Mouse, launching a new era in animation and pop culture.

In the 1920s, the 20th century.