"Electronic books." . . "Biology." . . "1900 - 1999" . . . . . "Juvenile works" . "Juvenile works"@en . . . . . . . "Biology : decade by decade" . . . "Biology decade by decade"@en . "Biology decade by decade" . . "History" . "History"@en . . "Electronic books"@en . "Chronicles developments and discoveries in biology throughout the twentieth century, decade-by-decade, and explores possibilities for the twenty-first, discussing such topics as genetics, chemical bonds and molecular structure, penicillin, DNA, evolutionary science, war- driven research, HIV and AIDS, and stem cell research." . . . . "JUVENILE NONFICTION Science & Nature General." . . "History, 20th Century." . .