Rescuers clear debris at Durbar Square after an earthquake with a 7.8 preliminary magnitude shook Kathmandu -- Nepal's capital -- and the densely populated Kathmandu Valley on Saturday, April 25, 2015. (Niranjan Shrestha/AP)

Photos: Earthquake strikes Nepal

An earthquake with a 7.8 preliminary magnitude struck Nepal on Saturday, April 25, 2015, resulting in mass casualties.

Dr. Mehmet C. Oz, chairman and Professor of Surgery, Columbia University College of Physicians and Surgeons, testifies on Capitol Hill in Washington, Tuesday, June 17, 2014 , before the Senate subcommittee on Consumer Protection, Product Safety, and Insurance hearing to examine protecting consumers from false and deceptive advertising of weight-loss products. (AP Photo/Lauren Victoria Burke)

Dr. Oz: We will not be silenced

Vowing that “we will not be silenced,” television’s Dr. Oz is fighting back against critics who are trying to get him removed from a faculty…