Young people's science encyclopedia.
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Nearly four-thousand alphabetically arranged topics from many areas of the biological and physical sciences. Also includes more than two hundred suggested experiments and projects.
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Nearly four-thousand alphabetically arranged topics from many areas of the biological and physical sciences. Also includes more than two hundred suggested experiments and projects.
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"Nearly four-thousand alphabetically arranged topics from many areas of the biological and physical sciences. Also includes more than two hundred suggested experiments and projects."
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