Researchers discovered that a 215-million-year-old reptile started life on four legs and switched to two as an adult.

Imitation may be the sincerest form of flattery, but the dinosaurs and pseudosuchian archosaurs reached this shape ...

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The killing of Iran’s Supreme Leader, Ali Khamenei, in a reported U. S.–Israeli strike on Tehran has ignited fierce debate over international law, regime-change politics and the role of Western powers ...