In which century did Europeans first visit Lake Chad?

Centennial Olympic Park and the Woodruff Arts Center are landmarks of which U.S. city? Which Houston Rockets star joined Shaquille O'Neal at center on the 1996 U.S. Olympic basketball team? The Bridge of the Americas crosses the Pacific approach to the canal in which Central American country? Central High School in which state capital was desegregated under federal troop escort on September 25, 1957? The High Renaissance, the era of Leonardo's "Last Supper" and Michelangelo's Sistine Chapel ceiling, peaked in the earl… CEO Angelo Mozilo received well over $100 million from which mortgage lender at the heart of the 2008 mortgage crisis? What was the middle name of cereal heiress Marjorie Post? What is the name of the ceremonial chamber used by the Hopi and other Pueblo peoples?