title: Ranking carcinogens for regulation.
abstract: In the issue of 9 August 1968 (p. 541), Science printed the Nobel lecture of Hans A. Bethe on "Energy production in stars." Eddington had at one time hypothesized that stellar energy arises from complete annihilation of matter. The energy to be set free by such a process, if it could occur, would be enough to supply the sun's radiation for 15,000 billion years. In the lecture, this number was erroneously given as 1500 billion years.
mesh_terms: D002273:Carcinogens / Q000145:classification
chemical_list: D002273:Carcinogens