Handshakes are not valued equally among all the social and cultural groups that practice them. According to Yuta Katsumi, a cognitive neuroscientist who currently researches memory but has conducted several studies on people’s evaluation of handshakes, everyone he studied appreciated a handshake. They were taken as a sign of goodwill and trustworthiness and business competence. However, Katsumi saw one group’s brains light up more than all the others when they witnessed a good, firm handshake: men, and white men in particular. “There’s a good amount of evidence that handshakes are a male activity,” Katsumi says. “If you do an observational study, male-male interactions involve a handshake much more frequently than female-female or mixed-gender interactions.” A quick Google search will reveal articles cataloging multiple strains of gendered handshake angst. There are worries about grip strength, chronicles of boardroom handshake snubs, advice columns urging women to engage in flesh pressing and for men to tone down the macho bone-crusher routine when dealing with their colleagues.