A team of scientists in London may have found a way to repair tooth enamel using an ingredient found in an unexpected place: human hair. Researchers at King’s College London experimented with keratin, ...

When Zsofia Kollar gets a haircut, she can’t help but think about all the precious material her hairdresser is sweeping into the trash. “I’ve always had a fascination with human hair,” said Kollar, a ...