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PURRS is a "pet-based urban rapid response to shaking" system that has been suggested by Celeste Labedz - a Caltech seismologist. Celeste tells Gareth Mitchell about cats' particular sensitivities to P-waves (primary waves), which are barely noticeable to humans, and how a network of cats could help us respond faster to earthquakes. (Image: A cat next to a bed. Credit: Getty Images.)