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National Museum of Natural History

Smithsonian paleontologist, Hans Sues, answers your questions in the National Museum of Natural History’s Deep Time YouTube series, “The Doctor Is In.” (Smithsonian Institution)

The Dr. Is In: Who Would Win in a Duel - T. rex or Stegosaurus - and Other Questions From Our Readers

Smithsonian paleontologist, Hans Sues, answers your questions in the National Museum of Natural History’s Deep Time YouTube series, “The Doctor Is In.” (Smithsonian Institution)

The Dr. Is In: Is Dimetrodon a Dinosaur and Other Questions from Our Readers

Smithsonian paleontologist, Hans Sues, answers your questions in the National Museum of Natural History’s Deep Time YouTube series, “The Doctor Is In.” (Smithsonian Institution)

The Dr. Is In: What Is the Smallest Known Dinosaur and Other Questions from Our Readers

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