Zimmerman Case app
With the national jobless rate at a four-year low, check out which states have the lowest unmployment rates.
The national unemployment rate hit a four-year low in February, according to the Labor Department. The rate fell to 7.7 percent from 7.9 percent in January.
Library of Congress
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.