Which movie starring Oprah Winfrey is based on a novel by a freelance science writer? 
The Immortal Life of Henrietta Lacks (film):  It is based on the book of the same name by Rebecca Skloot and documents the story of Henrietta Lacks, who was diagnosed with cervical cancer in the 1950s, and whose cancer cells (later known as HeLa) would change the course of cancer treatment.
i don't know