Explaining how the wind works, what windmills have contributed to the past, and why they offer environmental promise today as a source of clean, renewable energ

The history of American environmentalism is the history of men and women who dedicated their lives to protecting the nation's natural heritage. Almost singlehan

When it comes to chemistry, most kids have more questions than answers. Why do you get cavities when you eat too much sugar? How does sun block protect your ski

Kids will learn valuable hands-on lessons from this guide by constructing working models that generate renewable, alternative energy. Budding scientists learn h