ho are these 'guinea pig scientists'? Searching for clues to some of science's and medicine's bigger (and sometimes stranger) questions, they are all the men and women who devoted their lives to help find the answers. Spanning from the 1770s to the present-and uncovering the science behind digestion, the spread of yellow fever, the development of the first heart catheter, and more-their ten stories are at once scientifically detailed and fascinatingly personal....

Provides detailed descriptions and illustrations of more than 150 different animals and plants....

Each book: - Helps children identify different species. - Features detailed true-to-life illustrations. - Has fun activities and projects....

An introduction to the world of caterpillars, butterflies, and other insects, including identification information, educational activities, and fun facts....

Each book: - Helps children identify different species. - Features detailed true-to-life illustrations. - Has fun activities and projects....