On this day: May 20

POSTED: 02:26 PM PDT May 17, 2013    UPDATED: 11:00 PM PDT May 19, 2014 

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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