topday: SENATE FOREIGN RELATIONS COMMITTEE Bioterrorism Full committee hearing on the treat of bioterrorism and the spread of infectious diseases. Witnesses: Sam Nunn, co-chairman/CEO, Nuclear Threat Initiative; James Woolsey, former director, CIA, partner, Shea and Gardner; D.A. Henderson, director, Center for Civilian Biodefense Studies, Johns Hopkins University, Baltimore, MD; David Heymann, executive director, Communicable Diseases, World Health Organization, Geneva, Switzerland; Fred Ikle, distinguished scholar, Center for Strategic and International Studies; Frank Cilluffo, senior policy analyst, Center for Strategic and International Studies Location: 419 Dirksen Senate Office Building. 10 a.m. Contact: 202-224-3953 http://senate.gov/committee/foreign.html SENATE HEALTH, EDUCATION, LABOR AND PENSIONS COMMITTEE Stem Cell Research Full committee hearing to examine stem cell research issues. Witnesses: Sen. Arlen Specter, R-Pa.; HHS Secretary Tommy Thompson; Douglas Melton, Ph.D., Thomas Dudley Cabot Professor in the Natural Sciences, chairman, Department of Molecular and Cellular Biology, Harvard University; Karen Hersey, senior counsel, Intellectual Property, Massachusetts Institute of Technology; James Childress, Ph.D., Edwin Kyle Professor of Religious Ethics, University of Virginia; Kevin FitzGerald, SJ Ph.D., Georgetown University; John Chute, head, Hematopoietic Stem Cell Studies Section, NIDDK/Navy Transplantation and Autoimmunity Branch at NIH/Bethesda Naval Medical Center Location: 106 Dirksen Senate Office Building. 9:30 a.m. Contact: 202-224-5375 http://www.senate.gov/~labor **REVISED**