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When dinosaurs still left fresh footprints on the mud, our planet twirled around faster than it does today. Chronicled in the rings of an ancient timekeeper is a story of days half an hour shorter and years a week longer than they are today, according to a new study. That ancient timekeeper is an extinct rudist clam, one of a group of mollusks that once dominated the role that corals fill today in building reefs. The clam belonged to the species Torreites sanchezi and lived 70 million years ago in a shallow tropical seabed, which is now dry land in … Read more