Yeah. When I flew HAA, I had medcrew that took only the dewpoint spread into consideration when discussing the possibility of fog formation. So I taught a class at the next base meeting covering types of fog, how they form, and all the variables one should look at in hopes of making them more comfortable by showing them that a close dewpoint spread doesn't necessarily mean the helicopter's going to stop running and fall out of the sky. It went about how you would imagine. I was new to HAA and naive at the time.