What's the secret to frying teh perfect doughnut?

I have no idea where I found this:

According to a recent study, the secret to frying a perfect doughnut is in the cooking oil that is used. As doughnut makers know, fresh oil is not suitable for making the tasty treats because it leaves the doughnuts white, dry, and pasty. Oil that has been used too long also does not work because the doughnuts come out saturated with the oil.

Doughnut frying oil must either be broken in or mixed with seasoned oil before good doughnuts can be made with it. Properly seasoned oil contains just the right proportion of oil breakdown products. These soap-like molecules penetrate the outer layer of the dough, sealing it in a crispy layer and allowing the interior to steam-cook to just the right consistency.

More about the study:
http://www.findarticles.com/m1511/11_21/66456934/p1/article.jhtml

Fry your own doughnuts with these recipes:
http://fp.enter.net/~rburk/pastries/doughnuts/donut.htm

http://www.elliskaiser.com/doughnuts/recipies.html

A Cool Fact about another kind of pastry: http://features.LearningKingdom.com/fact/archive/2000/02/23.html