America’s robot spacecraft, the Viking I, successfully landed on Mars.
Source
The Colony of British Columbia joined the Canadian Confederation.
Single 'In-a-gadda-da-vida' by Iron Butterfly became the first heavy metal song to hit the charts.
London Euston railway station officially opened.
Jane Asher broke up her engagement to Paul McCartney live on television.
Linkin Park singer Chester Bennington committed suicide aged 41.