Two things I learned from girls, that contradicted what I might have supposed before.

1. Water is not the appropriate antidote for dry skin. It may seem that if your hands are dry, then water (being wet) would counteract that; apparently, this is not the case. You need lotion instead. Washing your hands repeatedly, or even taking long showers, isn't going to make you moister. At least not for long.

2. Not all girls' clothes have belt loops. If you're a guy, every pair of pants you own has either belt loops or an elastic waistband, so it doesn't totally matter if things fit. You can make any of a number of sizes fit, if you have a belt. But not so with girls' clothes. Apparently, for some things, you have to buy it in just the right size—then if you get any bigger or smaller, it doesn't fit anymore.

You learn something new every day.