Magic in a Drop of Water: How Ruth Patrick Taught the World About Water Pollution

This picture-book biography follows ecologist Ruth Patrick, whose early view of pond scum leads to a lifelong interest in waterways and the organisms within them. Working when few women were in her field, she studies river ecosystems and biodiversity long before water pollution becomes a widespread public concern. Her discoveries change how ecologists investigate pollution and provide other scientists with ways to study the health of rivers and their many life forms.