In case you haven’t yet seen enough evidence that men are treated as the neutral category, and women as a sub-category, Arielle C. and Ellie B. sent in another example, found on Neatorama. Here we have two rulers that list some important scientists throughout history, helpfully separated into Rulers of Science and Great Women Rulers of Science:
The only full image I could find of them is small, but I do see Marie Curie listed on both rulers. I can’t make out any other women on the Rulers of Science, but the text is very small and blurry in the image.
The point here isn’t really about the rulers themselves. I’ll give the company credit for trying to create a product that highlights women’s contributions to scientific discovery, only one of which would apparently be considered important enough to get a mention if we didn’t get a whole ruler all to ourselves. What’s noteworthy is the cultural repetition, experienced over and over in myriad large and small ways, of the message that default humans are male unless specifically marked otherwise, and that women aren’t neutral humans.