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The US National Science Foundation (NSF) has decided not to include a question about sexual orientation on one of its workforce surveys, setting off a social-media firestorm. More than 1,700 researchers have now signed an open letter urging the agency’s director to reconsider the decision. They argue that it is crucial to collect such information to understand the make-up of the scientific community and craft policies that lessen disparities for people from sexual and gender minorities.