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Scientific American for November has an "In Brief" item:
Researchers at UCalBerkeley and Stanford cast a set of T. Rex
dentures by pouring putty into a "punctured dinosaur pelvis." Then they
measured the force necessary to sink these "dentures" into cow hipbones.
Result: T. Rex could bite with a force of 3000 pounds. Only the alligator
among today's predators has a similar bite.