Wanted: madmen to swim the Zambezi Once described as a "brave madman", an adventurer is looking for six "mentally deranged" fellow South Africans to follow him down 3 000km of churning Zambezi river water, dodging sharks, hippos and snapping crocodiles. Louie Greeff, 50, of Johannesburg, attracted international media attention last year when he paddled the mighty Zambezi from its source in Zambia to the ocean on the Mozambican coast. Now Greeff wants to introduce the challenge to six willing South Africans and a six-member British team - an ambitious project he hopes to sell to television stations. 'Preferably insane' "I'd...