By Sarah A. Tishkoff, Robert Varkonyi, Nelie Cahinhinan, Salem Abbes, George Argyropoulos, Giovanni Destro-Bisol, Anthi Drousiotou, Bruce Dangerfield, Gerard Lefranc, Jacques Loiselet, Anna Piro, Mark Stoneking, Antonio Tagarelli, Giuseppe Tagarelli, Elias H. Touma, Scott M. Williams, Andrew G. Clark
By Sarah K. Volkman, Alyssa E. Barry, Emily J. Lyons, Kaare M. Nielsen, Susan M. Thomas, Mehee Choi, Seema S. Thakore, Karen P. Day, Dyann F. Wirth, Daniel L. Hartl
By J. Claiborne Stephens, Julie A. Schneider, Debra A. Tanguay, Julie Choi, Tara Acharya, Scott E. Stanley, Ruhong Jiang, Chad J. Messer, Anne Chew, Jin-Hua Han, Jicheng Duan, Janet L. Carr, Min Seob Lee, Beena Koshy, A. Madan Kumar, Ge Zhang, William R. Newell, Andreas Windemuth, Chuanbo Xu, Theodore S. Kalbfleisch, Sandra L. Shaner, Kevin Arnold, Vincent Schulz, Connie M. Drysdale, Krishnan Nandabalan, Richard S. Judson, Gualberto Ruaño, Gerald F. Vovis
By Chiara Zuccato, Andrea Ciammola, Dorotea Rigamonti, Blair R. Leavitt, Donato Goffredo, Luciano Conti, Marcy E. MacDonald, Robert M. Friedlander, Vincenzo Silani, Michael R. Hayden, Tõnis Timmusk, Simonetta Sipione, Elena Cattaneo
By Hervé Tettelin, Karen E. Nelson, Ian T. Paulsen, Jonathan A. Eisen, Timothy D. Read, Scott Peterson, John Heidelberg, Robert T. DeBoy, Daniel H. Haft, Robert J. Dodson, A. Scott Durkin, Michelle Gwinn, James F. Kolonay, William C. Nelson, Jeremy D. Peterson, Lowell A. Umayam, Owen White, Steven L. Salzberg, Matthew R. Lewis, Diana Radune, Erik Holtzapple, Hoda Khouri, Alex M. Wolf, Terry R. Utterback, Cheryl L. Hansen, Lisa A. McDonald, Tamara V. Feldblyum, Samuel Angiuoli, Tanja Dickinson, Erin K. Hickey, Ingeborg E. Holt, Brendan J. Loftus, Fan Yang, Hamilton O. Smith, J. Craig Venter, Brian A. Dougherty, Donald A. Morrison, Susan K. Hollingshead, Claire M. Fraser
COVER Hurricane Mitch on 28 October 1998. Mitch, responsible for more than 9000 deaths in Central America, was one of 23 major hurricanes to develop in the Atlantic basin since 1995. This recent increase in activity is due to changes in tropical North Atlantic sea surface temperatures and atmospheric vertical shear, creating conditions more conducive to hurricane formation. These conditions are expected to continue for another decade or more. 474 [Satellite- derived image: NOAA; H. F. Pierce and A. F. Hasler, NASA]