Learn each and every parts of human body and grab some unbelievable facts from the book, Knowledge Masters-How Your Body Works. This wonderful book tells about human body parts like heart, lungs, kidneys, blood cells, eyes, ears, bones and sperms. This is a amazing gift for anyone who has dream to become a doctor or wants to know every details of human body functioning. With eye-catching photographs and easy-to-understand English, it delights readers with hours of exciting facts.