Forty-five years ago, an estimated 1 billion viewers worldwide tuned in to see an unforgettable boxing match in October 1974, one that took place at 4 am local time in Kinshasa, Zaire (now the Democratic Republic of Congo). In that match - long known simply as "The Rumble in the Jungle" - a 32-year-old Muhammad Ali knocked out undefeated heavyweight champion George Foreman in the eighth round, reclaiming the title in the process after a seven-year hiatus.But it almost didn't happen.