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When universities invite me to speak to their faculty members about excellence in science, I emphasize the importance of diversity and inclusion. At one of these talks, about a year ago, I added a simple exercise on privilege. I asked the audience members to reflect on situations in which they had been outsiders, and then to share in small groups how it had felt. The room filled with the cacophony of conversations — here, one participant spoke of being the only woman on a committee; there, another described looking different from most professors in the university. I reminded them that many of their students, especially those from under-represented groups, might also feel that they don’t belong, and that it is our collective responsibility to create an inclusive environment.