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Science at Work in Baseball
Science at Work in Soccer
Solar Power
Along with geothermal energy, solar energy is now one of the least environmentally disruptive sources of power by which electricity is generated today. Sunlight is a free, …
How Do Hybrid Cars Work?
In recent years, there has been much concern about the world's reliance on nonrenewable resources, such as oil. Scientists are attempting to decrease our dependency on oil - …
Pennsylvania (ARC Edition): The Keystone State
Puerto Rico
This book explores the geography, history, people, government, and economy of the Island of Enchantment. Lists of key people, places, celebrations, plants and animals, cities, and …
Science at Work in Football
Pennsylvania
Nicknamed the Keystone State for the pivotal role it played in colonial days, Pennsylvania has transformed itself from an industrial hub whose strength rested on coal mining and …
Science at Work in Auto Racing
Pennsylvania
This book explores the geography, climate, history, people, government, and economy of Pennsylvania. Readers can use this as the definitive research tool for the facts on the …