EDITORIAL REVIEWS
Gr 5-9Expanded from the 18-volume 1991 edition, this sine qua non of
middle-grade science reference includes over 200 new entries among its 3000
plus; a separate volume of science projects (75 in all); and another containing
a wide array of tables, lists, charts (all unsourced, however); laudably current
topical bibliographies; and a complete index. Arranged in a single alphabet,
with more general subjects ("Algae" "Sleep" "Migration") set off by ruled
borders and larger headings, the articles are festooned with sharp, captioned,
color photos and paintings, plus plenty of cross-references. The layout is
lively enough to keep browsers hooked; the level of detail will support