The age of animal experiments is waning. Where will science go next?
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• Natural muscle fibers are made up of spring-like proteins that can contract and stretch without losing their original form, dissipate mechanical energy as heat and maintain incre
• A protein called neurofilament light chain (NfL)-studied in humans in the context of neurodegenerative diseases and aging-is also detectable in the blood of numerous animals, and
• Humans have climbed to the top of the food chain by skillfully hunting, trapping, and fishing for other animals at scales that far exceed other predators, altering how the animal