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A conundrum has long stumped polymer scientists: Elastic polymers can be stiff, or they can be tough, but they can’t be both. This stiffness-toughness conflict is a challenge for scientists developing polymers that could be used in applications including tissue regeneration, bioadhesives, bioprinting, wearable electronics, and soft robots. Researchers have resolved that long-standing conflict and developed an elastomer that is both stiff and tough.