Hear an excellent interview (podcast) with Robert Cialdini about Influence, Persuasion, and Pre-suasion.
Doctors, like anyone else, are highly influenced by many factors outside of the strictly medical information available to them. A second opinion is always a good idea, for medicine and anything else.
Social Engineering techniques can influence people to give up their cash, their personal information, or control of their computer. It nearly happened to me, and it happens to thousands of people around the world every day.
Reality is pliable. Trump is the first major political candidate in the US to wield this technique as a power.
Influence is used against you. Sign up to PRL and learn to recognize these techniques!
As homeopathy has demonstrated, even placebos work.