Principal Skinner hosts a diversity forum that discusses the different perceptions of men and women in core academic subjects, more specifically math. The forum goes astray, and Springfield Elementary gets a new principal that feels it's best to separate boys and girls in order to provide the best math education to each group. She develops this opinion based on stereotypes of boys and girls.
Marge starts a carpenting business and immediately faces difficulties: her customers are unwilling to allow a woman to work for them, regardless of how skilled she may be. Marge's customers have expectations as to what a carpenter should look like, and she does not fit that description. Marge works around her customers' expectations by having Homer interact with customers while doing the work herself without their knowledge.
Molly's mother announces that she will take a job at the factory, much to the surprise of her children. When she tells them that she plans to build planes and assemble war machinery, her children have a hard time picturing her out of her domestic duties. They feel she should be there for them at home since their father is in London supporting the war efforts.