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1) In 1978, President Carter led negotiations between the leaders of what two countries that led to the Camp David Accords?

2) One month after what country's worst oil spill, blackened west coast beaches have been cleaned by more than one million volunteers?

3) A roadside bomb ripped through a bus killing and wounding dozens, as a six year ceasefire between the government and Tamil Tiger rebels officially expired in what country?

4) The last time a U.S. citizen was executed in an espionage case was in June 1953, when what couple was convicted of revealing nuclear bomb secrets to the Soviet Union?

5) German researchers believe that they have solved the centuries-old mystery behind the identity of the person in which one of Leonardo da Vinci's works, a famous portrait?