Contains alphabetically arranged essays that include biographies of fifty mathematicians from throughout history, as well as descriptions of thirty-four math concepts and principles.
On a summer visit to her grandmother's cottage by the ocean, twelve-year-old Martha gains perspective on the death of a classmate, on her relationship with her grandmother, on her feelings for an older boy, and on her plans to be a writer.
Presents alphabetically arranged entries on life science concepts, discoveries, developments, and theories, and also includes a time line, research and activity section, bibliography, and black-and-white illustrations.
Highlights milestones in agriculture, astronomy, biology, chemistry, communications, computers, earth sciences, energy, mathematics, medicine, physics, and transportation from prehistory to the present.
Contains approximately 4,000 entries that provide information on historical "firsts" in the fields of science and technology, arranged chronologically within twelve subject chapters including computers, astronomy, and mathematics.
