After length, width and depth, what is often called the fourth dimension?

After leaving Spain in 1824, which artist settled in Bordeaux, where he produced many lithographs? Which 1982 Don Henley single, a satire of TV news, became his first big solo hit after the Eagles broke up? After leaving the Mayo Clinic, which author took his own life on July 2, 1961, at his home in Ketchum, Idaho? After leaving the Nation of Islam in March 1964, who formed the Organization of Afro-American Unity? After Lenin's death in 1924, who began purging his rivals and eventually took the top spot in the Soviet Union? In Harriet Beecher Stowe's most famous novel, which enslaved man is sold to the cruel planter Simon Legree after little… After losing two presidential races in the 1950s, who was named U.N. ambassador by John F. Kennedy? Which "Cagney & Lacey" star won the 1986 Emmy for lead actress in a drama, after co-star Tyne Daly had won it three yea…