'Pickled' baby mammoth opens window to Ice Age

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Fine-feathered dino sported bizarre bird tail

A pigeon-sized dinosaur that lived more than 100 million years ago sported four ribbon-like tail feathers that likely helped the creature balance on tree branches.

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Scientists wonder if ice on Mars ever melted

The apparent discovery of ice near Mars' north pole has scientists asking: Did the frozen water melt at some point in the planet's long history to create an environment friendly for life?

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