pA simple math problem lies at the heart of a heated debate over whether scientists should be allowed to publish provocative research into the transmissibility of H5N1 flu . Assuming the avian virus could spread easily among people, just how deadly would an H5N1 pandemic be for humans?/p a href=http://www.scientificamerican.com/article.cfm?id=h5n1-bird-flu-case-fatality-calculations[More]/a