Oprah Winfrey and Rose Byrne star in "The Immortal Life of Henrietta Lacks," based on the best-selling book by Rebecca Skloot. Lacks was a poor black woman who died at age 31 of cancer. Some cells taken without her knowledge in 1951 became one of the most important tools in medicine, vital for developing the polio vaccine, cloning, gene mapping, and more. For reasons no one understands, her cancer cells were remarkably vibrant, reproducing robustly and...