Presidents Obama and Medvedev formalized a historic nuclear arms pact to slash nuclear arsenals, possibly ushering in a new era of relations between the U.S. and Cold War enemy Russia. Jim Lehrer has more on the sweeping arms deal.
A roundup of art headlines.
Delegates from 50 countries just gathered in Prague to discuss the status of property looted by the Nazis during World War II, including hundreds of thousands of art works.
By Arts Desk
Top international astronomers voted Thursday to strip Pluto's planetary status that it has held since its discovery in 1930. The celestial object is now redefined as a "dwarf planet," leaving just eight major planets in the solar system.
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