UnScramble this Word: r t t d e g i?

Questions

With which sport is Michael Andretti identified?

Word meaning 'center of gravity?

ball & ________?

In 1945, near the end of World War II, an important conference involving Truman, Churchill, & Stalin was held in this Polish city?

In Greek mythology, this person opened a box which contained all of the varieties of evil & set them loose on the world to afflict humankind?