[Illustration: John H. Woodburn]
John H. Woodburn teaches chemistry at Walter Johnson High School in
Rockville, Md. In the past he taught at Michigan State University,
Illinois State Normal University, and Johns Hopkins University. He
received his A.B. from Marietta College, his M.A. from Ohio State
University, and his Ph. D. from Michigan State University. He is the
author of the book _Radioisotopes_ (J. P. Lippincott 1962), which is a
student’s introduction to this subject.
[Illustration: Frederick W. Lengemann]
Frederick W. Lengemann is associate professor of radiation biology at
New York State Veterinary College, Cornell University. He received his
B.S. and M.N.S. from Cornell and his Ph. D. from the University of
Wisconsin. He has been research associate in radiation biology and
assistant professor of chemistry at the University of Tennessee and
formerly was a biochemist with the Atomic Energy Commission, Division of
Biology and Medicine.