Jiankui He talks to Matthew Porteus of Stanford during a panel talk in Hong Kong following his presentation about his gene editing experiment on two twins. (Credit: Ernie Mastroianni/Discover)

This past November, Jiankui He, a Chinese scientist, claimed to have edited the genomes of twin girls when they were embryos. Genome editing on human embryos is against the law in the U.S., but not specifically outlawed in China. It is however wrought with ethical concerns because any changes to DNA ca