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Small wind turbines utilize wind energy to produce power with rated capacities of 100 kilowatts or less. With this increasingly popular technology, individual businesses, farms, and homes can generate their own electricity and cut their energy bills, while generating power in an environmentally sound manner. The challenges facing the engineers who are tasked with planning and developing these small wind systems are multifaceted, from choosing the best site and accurately estimating power output, to obtaining proper permitting and troubleshooting operational inefficiencies. Optimization of...

An Incan boy who tends llamas in a hidden valley in Peru learns the traditions and secrets of his ancestors.

"The story of an Incan boy who lives in a hidden valley high in the mountains of Peru with old Chuto the llama herder. Unknown to Cusi, he is of royal blood and is the 'chosen one.' A compelling story."--Booklist