Historical Events on May 21

Battle of Arras — 1940 World War II event

demon core — historical subcritical mass of plutonium

1950 Monaco Grand Prix — Formula One motor race held in 1950

1960 Valdivia earthquake — 9.4–9.6 magnitude earthquake in Chile

assassination of Rajiv Gandhi — 1991 assassination of the 6th Prime Minister of India

2000 European Grand Prix — Formula One motor race held in 2000

World Health Organization Framework Convention on Tobacco Control — treaty adopted by the 56th World Health Assembly

2008 UEFA Champions League Final — association football match