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How the Ice Age Worked
history.howstuffworks.com/historical-events/ice-age.htm
An ice age is a period of cooling, marked by the presence of glaciers and ice sheets. Learn how an ice age works and if we're in an ice age right now.
10 Terrifying Extinct Cetaceans
animals.howstuffworks.com/extinct-animals/10-terrifying-extinct-cetaceans.htm
Extinct cetaceans are more like sea monsters, and can make nightmares seem dull. See these 10 extinct cetaceans to explore the ancient world.
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