The subject of cancer risk assessment (S. Brudnoy, The Scientist, March 8, 1993, page 14) is of continuing interest to academic scientists, but even more important to regulatory agencies. This topic is not as controversial scientifically as some may make it. All human carcinogens are genotoxic; that is, they can react under suitable conditions with DNA and genes, a fact leading to analytical detection. An exception as a nongenotoxic human carcinogen is high levels of the hormone diethylstilbest

Marcia Clemmitt (The Scientist, Jan. 6, 1992, page 1) comments on hard times faced by book publishers. Currently, technical books from major publishers run from about 20 cents per page to more than 40 cents per page. Few are the books that cost less than $50. With reduced funding available for research, we can afford only the most essential monographs. In France, scientific publishers market most books as paperbacks. They are as durable as hardcover books. They can be produced more quickly an