Polio was one of the most dreaded epidemic diseases in history and claimed countless lives. It was the ingenuity and determination of Dr. Jonas Salk that resulted in the creation of the first safe and effective polio vaccine. But, who was the man behind the cure? Percy Spencer was a pioneer in the chemical synthesis of medicinal drugs from plants. He was also the first African-American chemist inducted into the National Academy of Science and received over 130 patents for chemical discoveries during his life. The collections of life stories about amazing scientists offer a unique insight into some very different aspects of the fields of science. The equally amazing life stories of William Shockley and Percy Julian are also explored.Learn more about these incredible individuals in their inspiring life stories in this unique audio collection from Amazing People Worldwide®. Each story comes alive through BioViews® which are short biographical stories similar to an interview.