Knowing When

Doctors and their advice have been co-opted by various industries, so most of their general advice is wrong to only accidentally correct. Their specific advice (which is not usually doled out to civilians) is typically correct. So, they can tell you the merits of using fibrin and cyanoacrylate adhesive to seal arterial sutures, but for diet and nutrition advice they are actively harmful.

One of the most valuable twenty-first century skills is knowing enough to know when to depend on experts and when to ignore them completely.