Yes, this is indeed an interesting read. I have referenced it quite a few times here on the forum, but most beekeepers are set in their ways and believe the more the better when it comes to ventilation. I find it very interested that Clark tries to demonstrate that bees can not rely on evaporation alone to remove all the moisture from the nectar. Granted I haven't tried validating his math, but that, with the fact that most feral colonies I find have very little ventilation leads me to believe he may be onto something. I have been wintering my bees with only a 3" x 3/8" bottom entrance for a few years now and I am pleased with the results. The more heat they can keep, the better they will build up. I have done some experiments with 7watt light bulbs and have seen many times, the queen move to lay in the bottom of the frames right over the light bulb, instead of up top where she would normally lay.