Travel back in time to the ice age! Saber-toothed cats, woolly mammoths, and more! Timeline Science: The Ice Age features all the Ice Age favorites as it chroni
Brrr…does it feel cold? Get out your gloves and get ready to experience the Ice Age! In Explore the Ice Age! with 25 Projects, readers ages 7-10 discover what
In 2001 a panel representing virtually all the world's governments and climate scientists announced that they had reached a consensus: the world was warming at
"Who were the first humans to inhabit North America? According to the now familiar story, mammal hunters entered the continent some 12,000 years ago via a land