Somervill, Barbara A

Presents an overview of the history of the calendar, in simple text with illustrations, from ancient Egyptian time keepers to cesium clocks that records the passage of time accurately. Includes time line.

Presents a short history of money describing the ancient system of bartering, various things that were used as money, early coins, and paper money.

Presents a short history of the post office examining the ancient forms of mail delivery in Egypt, China, and Persia; Benjamin Franklin and the U.S. Postal System, the Pony Express, air mail, and more.

Presents a history of clocks and discusses the ways ancient people recorded time, the early calendars of the Sumerians, Egyptians, Mayas, and Babylonians, as well as mechanical clocks, pendulum clocks, and wristwatches.

Presents a short history of the invention of the telephone, how people communicated before it, early telephones such as the Reis transmitter and receiver in the 1860s, and Alexander Graham Bell's initial intention to provide a machine for the deaf.

Traces the natural history of the grizzly bear, focusing on how that have come close to extinction and what can be done to ensure their survival.

Offers an overview of the natural history, distribution, physical characteristics, behavior, and conservation of the Florida panther.

Provides an overview the history, culture, society, and daily life in the empires of ancient Mesopotamia, which included Sumer, Babylonia, and Assyria, from 10,000 BCE until the Persian army invasion in 539 BCE, and describes events, people, places, and ideas of significance.

Traces the history of space exploration from the astronomers of ancient Greece to the landing of the Mars rovers in 2004, discussing the moon walk, the Apollo program, space shuttles, and other highlights.

Explains the development of the ancient Mayan empire, with maps showing where the civilization was and how it expanded over time, short biographies of key historical figures, and a timeline of important events.