Hi, With all due respect to DrGaff, credentials are not science. Edward Teller father of the Hydrogen Bomb had great credentials. Yet he said one day radiation would be found to be no more harmfull than smoking cigarettes. Such was not the case.
Credentials are a way of buying approval without science.
A person with credentials says it, so it must be true. Not at all. It does not work that way. That is a dictatorship by degrees. And degrees are cheap.