Jordyn Wieber, a member of the 2012 Olympic gymnastics team, made a surprise appearance at Larry Nassar's sex-abuse sentencing hearing.
Researchers made a mutant flu virus, then used it to make a better influenza vaccine
USA Gymnastics says athletes won't have to train at the Karolyi Ranch, where some gymnasts say they were molested by doctor Larry Nassar.
"He just thought he was so powerful he thought he could do anything," Susan Braudy told "Today" in her first on-camera interview about the alleged incidents.
More U.S. kids are getting their full series of vaccines, but more and more parents are also refusing vaccinations, new health insurance data show.