It is more difficult to walk on a sandy road than on a concrete road because
Options: sand is soft and concreter is hard, the friction between sand and feet is less than that between concrete and feet, the friction between sand and feet is more than that between concrete and feet, the sand is grainy but concrete is smooth
Stripped of his heavyweight title in 1967 for refusing induction into the U.S. military, Muhammad Ali regained the heavyweight championship on October 30, 1974, in Kinshasa, Zaire with an eighth-round knockout of which prizefighter?
Options: George Foreman, Joe Frazier, Leon Spinks, Sputnik
Options: the first Buddhist pilgrim of China to visit India during the reign of Chandragupta Vikramaditya, the discoverer of Puerto Rico and Jamaica, the first Buddhist pilgrim of India to visit China, None of the above