Meet the Swimming Reptiles
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2.3 |
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Meet the Small Dinosaurs
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2.4 |
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Meet the Flying Reptiles
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2.3 |
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Meet the Plant-Eating Dinosaurs
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2.6 |
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Meet the Meat-Eating Dinosaurs
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2.4 |
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Meet the Giant Dinosaurs
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2.4 |
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Vaccines
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2.9 |
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Germ Theory
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2.9 |
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X-Rays
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2.8 |
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Solar Panels
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2.9 |
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Light Bulbs
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2.8 |
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Smart Homes
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2.9 |
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Toilets
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2.9 |
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Refrigerators
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2.9 |
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TVs and Remote Controls
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2.9 |
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Antibiotics
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2.9 |
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Louisiana Purchase
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2.9 |
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Great White Sharks
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2.8 |
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Immigration through Ellis Island
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2.9 |
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Texas Revolution
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2.9 |
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Hammerhead Sharks
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2.9 |
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Can't Rest in Peace
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2.6 |
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Angel Sharks
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2.7 |
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Blue Sharks
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2.6 |
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