"Earth is home to trillions of germs. But for most of human history, people didn't know they existed! Learn how the microscope changed everything, allowing scientists to see germs-and discover their surprising benefits"--
"When a baby is born early, an incubator helps the child keep growing. At first, some medical experts were skeptical about these special cribs. But trailblazing doctors' "incubator exhibits" showed people how incubators save lives"--
"With X-rays, doctors detect problems human eyes can't see and even treat illnesses. This graphic history covers the discovery of X-rays, the spread of safety standards, and the start of digital X-rays and 3-D imaging"--
"For centuries, people misunderstood how the heart works. Even as organ transplants became more common, heart transplants remained dangerous. But small groups of pioneering doctors attempted this difficult surgery, changing the lives of patients"--
"Vaccines safely introduce the body to diseases, which helps people fight them later on. Early vaccinations took place centuries ago. Doctors across nations took up the fight, developing vaccines for diseases from smallpox to COVID-19"--