Nobel Prize winner Thomas Weller died August 23 at his home in Massachusetts, reports the New York Times. He was 93. Weller specialized in tropical medicine and won the Nobel Prize in Physiology or Medicine in 1954 with two colleagues for their work applying tissue culture research to studying viruses that enabled the development of the Salk and Sabin polio vaccines. Weller later studied schistosomiasis, varicella zoster viruses, and the German measles.