At 16, which future "Jerry Maguire" co-star was breakdancing on stage with Lionel Richie at the 1984 Olympics?

In 1991, at 15, Judit Polgar broke Bobby Fischer's record as the youngest person to earn which chess title? At 15 in 1989, Jack Staddon won the first of which contests sponsored by National Geographic? At about 15,200 feet, the Dufourspitze is the highest peak in which country? At 16 in 1785, which future first consul became head of his family and graduated from the Paris military academy? Puncak Jaya, the world's highest island peak, is on which island? Vinson Massif is the highest point on which continent? What is the highest point in Turkey? At 1,815 feet, which Toronto landmark gives the city some of the clearest TV reception in North America?