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1
Scientists find evidence for climate change in rock art, fossils, tree growth rings, and ice sheets /
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2
Explore the structural hierarchy of organization in living things, from cells to entire organisms /
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3
Overview of different types of grasslands and their locations, climate, and animal life /
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4
A history of women's suffrage around the world /
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5
Learn how an energy pyramid shows how energy flows from one level to the next in an ecosystem /
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6
Overview of the Seven Wonders of the ancient world /
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7
Learn about the important consequences that deforestation has on the global carbon cycle /
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8
Explanation of the principle of the conservation of energy /
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9
Learn how the printing press, invented by Johannes Gutenberg, ushered in a new era literacy /
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10
Explore the causes of wind and how it is formed /
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11
Overview of rock art images most commonly made on cave walls by ancient peoples throughout the world /
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12
Learn how the Louisiana Purchase doubled the size of the United States /
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13
Explore the many factors that control climate, including latitude, ocean currents, and wind /
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14
An overview of the Great Famine in Ireland /
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15
A survey of Mexico City's history as Tenochtitlan, the center of Aztec civilization /
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16
Timeline of women's voting rights /
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17
Learn about the important characteristics that distinguish fungi from plants and animals /
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18
Overview of recycling as a way to reuse waste materials /
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19
Learn how mutations in the dna sequence of a gene can change a trait in a helpful or harmful way /
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20
Learn how mushrooms reproduce using gills that hold thousands of reproductive cells called spores /
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