"The immortal life of Henrietta Lacks" by Rebecca Skloot
Henrietta died in 1951 from cervical cancer. Cells from the cancer were collected and found to remain viable and reproduce freely, allowing lots of research to be carried out on human cells. This resulted in lots of medical discoveries, including proof that the Polio vaccine was safe to use on humans, chemotherapy, cloning and many more
Perhaps all of us have benefited from these.
The book covers her early life, illness, family background and their reactions. Also the research that has been enabled by using her cells.
The cell line, known as Hela cells, is still used today in medical research.