I would give this 4 1/2 stars. It is such a good read! It is a great story that everyone should know as there isn't anyone in the first world who hasn't benefited from the medical leaps and bounds aided by this woman's cells. It is part biography, part history lesson, part science lesson wrapped up in a very human story that starts with just one woman suffering cervical cancer. There is very little that is acutely sad in this story, but it certainly evokes the sadness that comes whenever humanities dirty laundry is aired out.I think every single person should read this book. It loses 1/2 a star for writing style. It's her first book, she definitely has room to grow, and I look forward to seeing what she tackles next.