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1889
John Alexander MacWilliam, Scottish physiologist, discovered that he could restore heart rhythms in cats using a metronome and a needle electrode. His work went unrecognized until his paper on the subject resurfaced in 1972.
Links: Scotland, BioTech, Heart     Click to see the source(s) for this event 
 
1893 Jul 9
Daniel Hale Williams (1858-1931), an African-American surgeon, performed successful heart surgery on a teenager in Chicago.
Links: USA, Black History, Chicago, Medical, Heart     Click to see the source(s) for this event 
 
1938 Jul 18
Queen Marie of Romania died. She was the wife of King Ferdinand I, who reigned from 1914 to 1927. Born in England in 1875 as Princess Marie of Edinburgh, her father was Prince Alfred, a son of Queen Victoria. The heart of Marie was finally laid to rest on Nov 3, 2015, after criss-crossing the nation for 77 years.
Links: Romania, Heart     Click to see the source(s) for this event