An exhibition celebrating the life of Charles Darwin has failed to find a corporate sponsor because American companies are anxious not to take sides in the heated debate between scientists and fundamentalist Christians over the theory of evolution.The entire $3 million (£1.7 million) cost of Darwin, which opened at the American Museum of Natural History in New York yesterday, is instead being borne by wealthy individuals and private charitable donations.The failure of American companies to back what until recently would have been considered a mainstream educational exhibition reflects the growing influence of fundamentalist Christians, who are among President George W...