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Presents biographical sketches highlighting the contributions of women, mostly American, to the field of medicine in the nineteenth and twentieth centuries.

Examines the advancements made in earthquake prediction and detection and in building safer structures.

Explains what foodborne illness are, how they spread, and how they can be prevented.

Defines matter and discusses its changing molecular base. Provides information on solids, liquids, and gases and what makes them change.

Describes different kinds of energy, the properties of stored and moving energy, sources of energy, and related topics such as pollution.

Presents an introduction to the different states of matter, and discusses the properties of solids, liquids, and gases, and how they are used.

Presents a children's story about green sea turtles for early readers, and describes what they look like, where they live, how they care for their young, and other interesting facts.

Presents a children's story about the hammerhead shark for early readers, and describes what they look like, where they live, how they care for their young, and other interesting facts.

Presents a children's story about the humpback whale for early readers, and describes what they look like, where they live, how they care for their young, and other interesting facts.

Provides an introduction to the geography, natural resources, history, government, economy, important sites, daily life, and people of Puerto Rico; and includes tips on visiting the commonwealth; related projects, a time line, a glossary, fast facts, a biographical dictionary, and resources.

Describes the various parts of the human circulatory system and explains how and why blood is circulated throughout the body.

Provides information about matter, explaining what it is, describing the three different kinds of matter, and looking at how it changes from one form to another.

Presents a children's story about Bottlenose Dolphins for early readers, and describes what they look like, where they live, how they communication with one another, how they care for their young, and other interesting facts.

Presents a children's story about clown fish for early readers, and describes what they look like, where they live, how they care for their young, and other interesting facts.

Text and illuminative color diagrams describe the science of water waves, sound waves, light waves, radio waves, and earthquake waves.