Because there will be a test later on. Well, no, but I get exasperated when people employ false arguments to explain the reasons why women earn less than men. I wrote a series of posts on this topic a few years ago, and though some of the data may be a little old now all the basic principles and the major findings apply. Here are the posts:
Part 1. The theories on why women earn less than men, on average.
Part 2. Empirical evidence, what it tells us and what it does not tell us.
Part 3. How to talk to wingnuts on this topic if you must (channeling Ann Coulter)
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Posted earlier.