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Smithsonian Geologist Liz Cottrell answers your questions in the National Museum of Natural History’s YouTube series, “The Doctor Is In.” (Smithsonian Institution)

How to Identify Rocks and Other Questions From Our Readers

Don't miss the season finale of the National Museum of Natural History's popular YouTube series, the "Doctor Is In."

Smithsonian Geologist Liz Cottrell answers your questions in the National Museum of Natural History’s YouTube series, “The Doctor Is In.” (Smithsonian Institution)

How Do Volcanologists Predict Eruptions and Other Questions From Our Readers

In this week's episode, find out which state is the best for collecting rocks, what to use when you’re out of toilet paper in the wild and how volcanologists predict eruptions using gas emissions.

Smithsonian Geologist Liz Cottrell answers your questions in the National Museum of Natural History’s YouTube series, “The Doctor Is In.” (Smithsonian Institution)

How Much Pressure is at Earth’s Center and Other Questions From Our Readers

Find out how much pressure is at the Earth’s center, what is Cottrell’s favorite thing about rocks and where she likes to hike in the latest episode of the National Museum of Natural History's popular YouTube series, "The Doctor Is In."

Smithsonian Geologist Liz Cottrell answers your questions in the National Museum of Natural History’s YouTube series, “The Doctor Is In.” (Smithsonian Institution)

Which Volcano Spews Colder Lava and Other Questions From Our Readers

Check out the latest episode of the National Museum of Natural History's popular YouTube series "Doctor is In."

Smithsonian Geologist Liz Cottrell answers your questions in the second season of the National Museum of Natural History’s YouTube series, “The Dr. Is In.” (Smithsonian Institution)

What’s Hotter Than the Sun and Other Questions From Our Readers

Find out what’s hotter than the sun, how many active volcanoes are in the United States and which national park is Smithsonian Geologist Liz Cottrell’s favorite in the latest episode of "The Doctor Is In."

Smithsonian Geologist Liz Cottrell answers your questions in the second season of the National Museum of Natural History’s YouTube series, “The Dr. Is In.” (Smithsonian Institution)

Outdoorsy Volcano Expert Answers Your Questions in Season 2 of ‘The Dr. Is In’

Smithsonian Geologist Liz Cottrell answers your questions about geology, the great outdoors and living off the grid in the second season of the National Museum of Natural History’s YouTube series, “The Dr. Is In.”

Insect expert Dan Babbitt talks about the Chilean Rose Tarantula on “Smithsonian Science How,” a video series for students. (Smithsonian Institution)

Seven Ways to Learn About Natural History From Home

Deepen your understanding of the natural world from home with these free resources.

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

Cat-loving paleontologist answers your questions in the National Museum of Natural History's YouTube series, "The Doctor Is In."

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

Cat-loving paleontologist answers your questions in the National Museum of Natural History's YouTube series, "The Doctor Is In."

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

Cat-loving paleontologist answers your questions in the National Museum of Natural History's YouTube series, "The Doctor Is In."

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 Did Stegosaurus Eat and Other Questions from Our Readers

Cat-loving paleontologist answers your questions in the National Museum of Natural History's YouTube series, "The Doctor Is In."

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: Are Birds Dinosaurs and Other Questions from Our Readers

Cat-loving paleontologist answers your questions in the National Museum of Natural History's YouTube series, "The Doctor Is In."

Was the Loch Ness Monster a Plesiosaur? Smithsonian paleontologist, Hans Sues, answers your questions in the National Museum of Natural History’s YouTube series, “The Doctor Is In.” (Smithsonian Institution)

Was the Loch Ness Monster a Plesiosaur and Other Questions from Our Readers, Including Slash (Yes, THE Slash).

Cat-loving paleontologist answers your questions in the National Museum of Natural History's YouTube series, "The Doctor Is In."

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

Is Die Hard a Christmas Movie? Smithsonian Scientist Weighs In

Cat-loving paleontologist answers your questions in the National Museum of Natural History's YouTube series, "The Doctor Is In."

Cat-loving paleontologist Hans Sues answers your questions about dinosaurs, humans, and cats in the Smithsonian's new YouTube series,

Ask This Paleontologist Anything about Dinosaurs, Humans and… Cats?

Paleontologist Hans Sues answers your questions about dinosaurs, humans and cats in the Smithsonian's new YouTube series, "The Dr. Is In."

The

The Dr. Is In: Cat-loving Paleontologist Answers Your Questions in New YouTube Series

Paleontologist Hans Sues answers your questions about dinosaurs, humans and cats in the Smithsonian's new YouTube series, "The Dr. Is In."

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