Kathleen Krull's Giants of Science books are recognized as a unique series in which biography, social history, and scientific discoveries blend together into compellingly readable books for older readers. The books in the Giants of Science series--Leonardo da Vinci, Isaac Newton, Sigmund Freud, Marie Curie, Albert Einstein, Charles Darwin, and Benjamin Franklin--have garnered a galaxy of starred book reviews. Kathleen Krull lives in San Diego, California. Visit her at KathleenKrull.com.