Vaccines have changed modern medicine, leading to a 99 percent decline in the incidence of more than a dozen potentially deadly diseases. And the innovations keep coming. Now, in addition to a yearly ...

Whether you’ve got fine curls that frizz up, dry out, get greasy fast, or fall flat — or you’re working with coily 4B/4C hair that battles breakage, shrinkage, and moisture loss — you’ve probably ...