From the very beginning there was something uncanny about the cancer cells on Henrietta Lacks’s cervix. Even before killing Lacks herself in 1951, they took on a life of their own. Removed during a biopsy and cultured without her permission, the HeLa cells (named from the first two letters of her first and last names) reproduced boisterously in a lab at Johns Hopkins — the first human cells ever to do so. HeLa became an instant biological celebrity, traveling to research labs all over the world. Meanwhile Lacks, a vivacious 31-year-old African-American who had once been a tobacco farmer, tended her five children and endured scarring radiation treatments in the hospital’s “colored” ward.

After Henrietta Lacks’s death, HeLa went viral, so to speak, becoming the godmother of virology and then biotech, benefiting practically anyone who’s ever taken a pill stronger than aspirin. Scientists have grown some 50 million metric tons of her cells, and you can get some for yourself simply by calling an 800 number. HeLa has helped build thousands of careers, not to mention more than 60,000 scientific studies, with nearly 10 more being published every day, revealing the secrets of everything from aging and cancer to mosquito mating and the cellular effects of working in sewers.

HeLa is so outrageously robust that if one cell lands in a petri dish, it proceeds to take over. And so, like any good celebrity, HeLa had a scandal: In 1966 it became clear that HeLa had contaminated hundreds of cell lines, destroying research as far away as Russia. By 1973, when Lacks’s children were shocked to learn that their mother’s cells were still alive, HeLa had already been to outer space.

During the eight months that Lacks herself was dying of cancer, the HeLa cells so thoroughly eclipsed her that a lab assistant at her autopsy glanced at her painted red toes and thought: “Oh jeez, she’s a real person. . . . I started imagining her sitting in her bathroom painting those toenails, and it hit me for the first time that those cells we’d been working with all this time and sending all over the world, they came from a live woman. I’d never thought of it that way.”