Saturday citations: Two T. rexes and new exercise guidance that scientists are not calling 'easy'

John Hammond voice: "Welcome... to Saturday Citations." We're talking about different types of T. rexes today, along with some unwelcome news about cardiovascular health, but this week also brought news about the connection between poor grip strength and depression; scientists have improved knowledge of sea level rise and confirm it's accelerated since 1960; and researchers provided new insights into how the human hand developed from those of our ape-like ancestors.