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On this day: May 20

POSTED: 2:26 PM May 17 2013   UPDATED: 11:00 PM May 19 2013

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 - Vasco da Gama
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Library of Congress

1498: Portuguese explorer Vasco da Gama discovers the sea route to India when he arrives at Calicut, India.