When I talked to Howard Jones fifty years after he found the tumor on Henrietta’s cervix, he was in his early nineties and had seen thousands of cervical cancer cases. But when I asked if he remembered Henrietta, he laughed. “I could never forget that tumor,” he said, “because it was unlike anything I’ve ever seen.” I talked to many scientists about HeLa, and none could explain why Henrietta’s cells grew so powerfully when many others didn’t even survive. Today it’s possible for scientists to immortalize cells by exposing them to certain viruses or chemicals, but very few cells have become
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