Grade 9 Up. Updating a 20-volume set for a 5-year revision of Science & Technology
is a difficult task. When original articles are written by experts in their fields,
basic information may remain the same, but it is hoped that some "recent developments"
would be added. Updated materials are evidenced in entries such as Asia, climate
modeling, geologic thermometry, and global positioning systems. In some sections, such
as compact disc, computer graphics, electric-power generation, gravitation, nuclear
engineering, and production of human insulin, there are no changes to the text, but
the bibliographies have been updated. Entries on acquired immunological tolerance,
aircraft design, fingerprinting, industrial trucks, and narcotics have not been updated.
There are new entries in this revision, such as climate history, clinical immunology,
fullerene, global warming, geographic information systems, object-oriented programming,
and nuclear medicine. Some of the entries have been completely rewritten by new authors,
such as those on acquired immune deficiency syndrome, aircraft-collision avoidance system,
breast disorders, geological time scale, North America, nuclear magnetic resonance, and
radiation chemistry. Topics from 1994-1997 yearbooks, such as hanta viruses, are not
included in this revision. According to the publishers, 23% of 7100 entries are new or
totally revised, 1750 of 13,000 illustrations are entirely new, and 6 color plates are
new. This encyclopedia set is recommended for high schools that do not have the 1992 edition.

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