The Big Bang Theory

Gerry Bailey

Sea transportation

Gerry Bailey

Galileo's telescope

Gerry Bailey

Spinosaurus

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Marco Polo's silk purse

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Tylosaurus

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Ankylosaurus

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Armstrong's moon rock

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Parasaurolophus

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Julius Caesar's sandals

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Leonardo's palette

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Common cents

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Stegosaurus

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Great Inventors

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Circles (Stone Age Geometry)

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Splitting Apart

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Winding Around

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Columbus's chart

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Save, Spend, Share

Gerry Bailey

Get rich quick?

Gerry Bailey

Money, it's our job

Gerry Bailey

Pulling up

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Early Civilizations (Crafty Inventions)

Gerry Bailey

Powerful machines

Gerry Bailey