Worldwide, the smallpox vaccine saves approximately 5 million lives every year. Each year in the United States, more than 2,000 people undergo heart transplants. Doctors can cure congenital blindness with gene therapy. What could happen if we stop vaccinating? Would there be fewer opportunities for surgery if we didn't have anesthesia? What if scientists quit researching new cures for diseases? The Medical Marvels series puts readers at the forefront of medical technology. Students will study the history of these advances, the science behind the medical practices, and the individuals responsible for major breakthroughs. Engaging, straightforward text and oversized full-color photos allow readers to explore the methods used to make the discoveries, and examine the risks and controversies. Aligned to Common Core Standards and correlated to state standards.Essential Library is an imprint of Abdo Publishing, a division of ABDO.