Medical researcher Oswald Hope Robertson performed the first-ever blood transfusion using stored and refrigerated blood.
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America banned all advertisements of cigarettes on TV and radio.
Ellis Island opened as a US immigration inspection station.
The Union Jack flag was flown for the first time in Dublin, Ireland, to commemorate the union between Great Britain and Ireland.
The Julian Calendar was used for the first time.
Estonia joined the Eurozone and adopted the Euro as its currency.