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Hair-like sensors are suspected to aid fish navigation in complex environments. Laboratory experiments and computational simulations reveal how these sensors can detect water flow to direct the swimming responses of fish. See Letter p.445
Mosquitoes flap their long, thin wings four times faster than similarly sized insects. Imaging and computational analysis of mosquito flight illuminates some aerodynamic mechanisms not seen before in animal flight. See Letter p.92
Many organ surfaces are covered by a protective epithelial-cell layer. It emerges that such layers are maintained by cell stretching that triggers cell division mediated by the force-sensitive ion-channel protein Piezo1. See Letter p.118