The tennis star's visa was revoked on public interest grounds three days before the Australian Open is to begin.
Gov. Asa Hutchinson has hit the road, meeting face-to-face with residents to try to overcome vaccine hesitancy — in many cases, hostility — in Arkansas.
HuffPost Science Correspondent Cara Santa Maria speaks with Seth Mnookin, author of "The Panic Virus," about the vaccine autism controversy and why it continues to persist.