Of course, there is another formula that comes to mind. This one deals with attention to detail.
A is the relevance of a subject to my job, B is my initial interest in a subject, C is the chance I might never have to apply such a thing at my job, and D is the attractiveness of the woman presenting it.
A*B == D/C
There is a reverse proportionality with A and C, though, so it actually can be said that A == 1/C. So therefore, all other things being equal, if the presenter is attractive enough and subject matter relevant, then B====D
If you stare at that equation long enough (and sideways), you may never read any of my posts again.