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Rescue crews aided by sniffer dogs dug through crumbled homes Thursday looking for earthquake survivors as Italy again anguished over how to secure its ancient towns and modern cities from the country's highly seismic terrain.
FULL SHOW: Search for survivors • Science behind the quake • Biden in Turkey • Activist on trial • New way to treat tremors • New planet may be Earth 2.0
A strong earthquake in central Italy reduced three towns to rubble as people slept.