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Dinosaur Debate

Early Mammal Debate Heats Up

natureheader | Ewen Callaway | Posted 01.25.2014 | Science

Did the first mammal with a placenta live alongside the dinosaurs — or did it emerge after a gigantic asteroid wiped them out? This is the subject o...

Dinosaur Debate Rages Over Triceratops, Torosaurus

Posted 03.02.2012 | Science

By: Jennifer Welsh, LiveScience Staff Writer Published: 02/29/2012 05:26 PM EST on LiveScience The debate continues over how many species of hor...