On this day: May 20

POSTED: 5:26 PM May 17 2013   UPDATED: 2:00 AM May 20 2013
Vasco da Gama arriving in India, 1498

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.