called "The Terawatt Challenge", the need to develop a new power source capable of increasing "our energy output by a minimum factor of two, the generally agreed-upon number, certainly by the middle of the century, but preferably well before that." He also presented a list entitled "Top Ten Problems of Humanity for Next 50 Years". It can be interesting to compare his list, in order of priority, to the Ten Threats formulated by the U.N.'s High Level Threat Panel in 2004. Smalley's list, in order of priority, was: Energy Water Food Environment Poverty Terrorism & war Disease Education Democracy Population Smalley regarded several problems as interlinked: the lack of people entering the fields of science and engineering, the need for an alternative to fossil fuels, and the need to address global warming. He felt that improved science education was essential, and strove to encourage young students to consider careers in science. His slogan for this effort was "Be a scientist, save the world." Smalley was a leading advocate of the National Nanotechnology Initiative in 2003. Suffering from hair loss and weakness as a result of his chemotherapy treatments, Smalley testified before the congressional testimonies, arguing for the potential benefits of nanotechnology in the development of targeted cancer therapies. Bill 189, the 21st Century Nanotechnology Research and Development Act, was introduced in the Senate on January 16, 2003, by Senator Ron Wyden, passed the Senate on November 18, 2003, and at the House of Representatives the next day with a 405–19 vote. President George W. Bush signed the act into law on December 3, 2003, as Public Law 108- 153. Smalley was invited to attend. Personal life Smalley was married four times, to Judith Grace Sampieri (1968–1978), Mary L. Chapieski (1980–1994), JoNell M. Chauvin (1997–1998) and Deborah Sheffield (2005), and had two sons, Chad Richard Smalley (born June 8, 1969) and Preston Reed Smalley (born August 8, 1997). In 1999, Smalley was diagnosed with cancer. Smalley died of leukemia, variously reported as non-Hodgkin's lymphoma and chronic lymphocytic leukemia, on October 28, 2005, at M.D. Anderson Cancer Center in Houston, Texas, at the age of 62. Upon Smalley's death, the US Senate passed a resolution to honor Smalley, crediting him as the "Father of Nanotechnology." Religion during final years Smalley, who had taken classes in religion as well as science at Hope College, rediscovered his religious foundation in later life, particularly during