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On this day: May 20

Published On: May 17 2013 04:26:12 PM CDT   Updated On: May 20 2013 01:00:00 AM CDT

Vasco da Gama arrives in India, Christopher Columbus dies, Norman Rockwell makes his Saturday Evening Post cover debut, HIV is discovered, and "Cheers" airs its series finale, all on this day.

OTD May 20 - HIV discovery
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1983: In the journal Science, two separate research groups led by Robert Gallo and Luc Montagnier independently publish their findings that a novel retrovirus, later named HIV, may be infecting AIDS patients.

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