> I am not particularly knowledgeable about philosophy as a modern discipline, but taking philosophy courses as an undergraduate taught me a lot, particularly about the limits of knowledge and scientific enquiry.

to which I replied

> The trouble is, we have to take your word for it that philosophy taught you a lot that the rest of us find useful, as there's little Independent verification

Personally, I don't trust anyone to certify that someone else has learned "a lot...about the limits of knowledge and scientific enquiry" the way I trust the FAA to certify (indirectly) that someone has learned aircraft mechanics, or the State Bar of California to certify that someone has learned California law. Do you?