History Today: How the Soviet Union carried out world's biggest nuclear bomb test

The Soviet Union detonated the most powerful nuclear weapon in the history of humankind, the Tsar Bomba, on October 30, 1961. Codenamed 'Ivan' by its creators, it was tested over Novaya Zemlya, a remote Arctic archipelago. On this day in 1973, the Bosphorus Bridge was inaugurated in Istanbul, Turkey. It is the bridge that connects the European and Asian sides of Istanbul

Explainers