[Illustration: ISAAC ASIMOV received his academic degrees from Columbia
University and is Associate Professor of Biochemistry at the Boston
University School of Medicine. He is a prolific author who has written
over 65 books in the past 15 years, including about 20 science fiction
works, and books for children. His many excellent science books for the
public cover subjects in mathematics, physics, astronomy, chemistry, and
biology, such as _The Genetic Code_, _Inside the Atom_, _Building Blocks
of the Universe_, _The Living River_, _The New Intelligent Man’s Guide
to Science_, and _Asimov’s Biographical Encyclopedia of Science and
Technology_. In 1965 Dr. Asimov received the James T. Grady Award of the
American Chemical Society for his major contribution in reporting
science progress to the public.]
[Illustration: THEODOSIUS DOBZHANSKY was graduated from Kiev University
and is now a professor at the Rockefeller University. He has done
research in genetics and biological evolution on every continent except
Antarctica. Among his distinguished published works are _Radiation,
Genes, and Man_, _Heredity and the Nature of Man_, _Mankind Evolving_,
and _Evolution, Genetics, and Man_. Mr. Dobzhansky received the Daniel
G. Elliot Prize and Medal and the Kimber Genetics Award from the
National Academy of Sciences in 1958, and the National Medal of Science
awarded by the President of the United States, in 1965.]