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A history of military technology from ancient to modern times.

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From roaring oceans to trickling streams, water covers seventy percent of our planet! But did you know that less than one percent of Earths water is usable by humans? Most water on Earth is salt water. It cant be used for drinking, bathing, or growing plants. We need freshwater. Yet about two-thirds of Earths freshwater is frozen solid at the North and South Poles. And the water we can accessfrom lakes, rivers, streams, wetlands, or undergroun...

This book explains how science helps athletes stay safer, perform better, and have more fun.

How many legs do spiders have? What are baby spiders called? This book takes an in-depth look at this familiar but fascinating animal.

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