Even as Dr. Ben Carson touts his medical expertise as a qualification in his candidacy for President, he is stuck having to explain why he once claimed that his prostate cancer had been cured by a junk science supplement consisting of aloe vera and tree bark. Carson, who has rejected most modern scientific principles during his campaign as he is rejected climate change and other basics, has been caught on video making the claims as part of a pyramid scheme promoting the supplement , even as he denied any connection during the third republican debate. In what might be the...