Unfortunately, each of us has at one time or another suffered from a toothache or caught the flu. And then I had to go to see a doctor. The doctor put a filling, prescribed pills, and soon the disease went away. It seems simple. But no - in order to treat people, doctors around the world have conducted thousands of experiments for centuries and solved many mysteries. Each decision not only brought relief to the sick, but also raised new questions. Is it possible for a person to sew on a monkey's paw instead of his own hand? What do vampires get sick with? Why did AIDS appear after smallpox disappeared? Some questions have already been answered and discussed in this book, but others remain to be answered. Maybe you can do this?