Rebecca Skloot’s “The Immortal Life of Henrietta Lacks” is the fascinating true story of a woman known to scientists around the world as “HeLa.” She was a poor Southern tobacco farmer who worked the same land as her slave ancestors, yet her cells, taken without her knowledge, became one of the most important tools in medicine. The first “immortal” human cells grown in culture, they are still alive. Hear Rebecca Skloot in Middlesex Community College’s “One World Series” on Tuesday, Feb. 8, at 10.30 a.m., in the MCC Campus Cafeteria in the main building downtown at 33 Kearney Square. This event is free and open to the public.