Terry Fox begins his “Marathon of Hope”.

Soldiers who were marching on the Broughton Suspension Bridge in Manchester, England cause it to collapse.

The Soviet submarine K-8, carrying 4 nuclear torpedoes, sinks in the Bay of Biscay after a fire.

The Soviet submarine K-8, carrying 4 nuclear torpedoes, sinks in the Bay of Biscay after a fire.

The polio vaccine is declared safe and effective.