Learn about new tools for spies.

From roaring oceans to trickling streams, water covers seventy percent of our planet! But did you know that less than one percent of Earth's water is usable by humans? Most water on Earth is salt water. It can't be used for drinking, bathing, or growing plants. We need freshwater. Yet about two-thirds of Earth's freshwater is frozen solid at the North and South Poles. And the water we can access-from lakes, rivers, streams, wetlands, or underground...

Introduces the life cycle of a pumpkin from the sprouting of a seed through its 16 weeks of growth.

A history of military technology from ancient to modern times.

"Discusses dictatorships as a political system, and details the history of dictatorships throughout the world"--Provided by publisher.