How do we know about ice ages? Scientists study ice. Scientists study clues from glaciers. Scientists study fossils.
What Do You Think? How did humans live during the ice age?
Photo Credit: Corbin17/Alamy Stock Photo
In the Know
What keeps trees from freezing in winter?
Sap keeps tree cells from freezing in winter. Sap helps … read more
In the Know
Special Money
The United States Mint makes the money we use. The … read more
In the Know
Native Truths at the Field Museum of Natural History
These baskets are also in the exhibit. The baskets were … read more