_The Useful Atom_, William R. Anderson and Vernon Pizer, The World Publishing Company, New York 10022, 1966, 185 pp., $5.75. Grades 7-12. _Working with Atoms_, Otto R. Frisch, Basic Books, Inc., Publishers, New York 10016, 1965, 96 pp., $3.50. Grades 9-12. Footnotes [1]It is called this because 210 is the total number of protons and neutrons in its nucleus. [2]See the reading list on page 44. [3]See _Secrets of the Past: Nuclear Science and Archaeology_, which is listed on the inside back cover of this booklet. PHOTO CREDITS Cover courtesy Groninger Museum voor stad en Lande Page 5 Yale Joel, _Life_ magazine, copyright © Time, Inc. 6 Her Majesty the Queen, copyright © reserved 7 & 8 Ullstein Bilderdienst 10 Rijksmuseum, Amsterdam 23 National Gallery of Art, Washington, D. C., Andrew Mellon Collection 35 & 40 National Gallery of Art, Washington, D. C., Chester Dale Collection 43 National Gallery of Art, Washington, D. C., Andrew Mellon Collection ★ U.S. GOVERNMENT PRINTING OFFICE: 1974—747-556/15 The U. S. Atomic Energy Commission publishes this series of information booklets for the general public. The booklets are listed below by subject category. If you would like to have copies of these booklets, please write to the following address for a booklet price list: USAEC—Technical Information Center P. O. Box 62 Oak Ridge, Tennessee 37830 School and public libraries may obtain a complete set of the booklets without charge. These requests must be made on school or library stationery. Chemistry IB-303 The Atomic Fingerprint: Neutron Activation Analysis IB-301 The Chemistry of the Noble Gases IB-302 Cryogenics: The Uncommon Cold IB-304 Nuclear Clocks IB-306 Radioisotopes in Industry IB-307 Rare Earths: The Fraternal Fifteen IB-308 Synthetic Transuranium Elements Biology IB-101 Animals in Atomic Research IB-102 Atoms in Agriculture IB-105 The Genetic Effects of Radiation IB-110 Preserving Food with Atomic Energy IB-106 Radioisotopes and Life Processes IB-107 Radioisotopes in Medicine IB-109 Your Body and Radiation The Environment IB-201 The Atom and the Ocean IB-202 Atoms, Nature, and Man IB-414 Nature’s Invisible Rays General Interest