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You've probably heard it said that when it comes to their psychology, it's almost as if men are from Mars and women are from Venus. But how different are men and women really? To find out, let's start by looking at something on which men and women really do differ and plotting some psychological gender differences on the same scale. One thing men and women do really differ on is how far they can throw a ball. So if we look at the data for men here, we see what is called a normal distribution curve. A few men can throw a ball really far, and a few men not far at all, but most a kind of average distance. And women share the same distribution as well, but actually there's quite a big difference. In fact, the average man can throw a ball further (1)________________________. So now let's look at what some psychological gender differences look like on the same standardized scale.

Any psychologist will tell you that men are better at spatial awareness than women -- so things like map-reading, for example -- and it's true, but let's have a look at the size of this difference. It's tiny; the lines are so close together they almost overlap. In fact, the average woman is better (2)________________________, and of course, if that was 50 percent, then the two genders would be exactly equal. It's worth bearing in mind that this difference and the next one I'll show you are pretty much the biggest psychological gender differences ever discovered in psychology. So here's the next one.

Any psychologist will tell you that women are better with language and grammar than men. So here's performance on the standardized grammar test. There go the women. There go the men. Again, yes, women are better on average, but the lines are so close that 33 percent of men (3)________________________, and again, if it was 50 percent, that would represent complete gender equality. So it's not really a case of Mars and Venus. It's more a case of, if anything, Mars and Snickers: basically the same, but one's maybe slightly nuttier than the other. I won't say which.