I found this Trilogy (Mother Earth, Father Sky; My Sister the Moon; Brother Wind) fascinating. Sue Harrison did extensive research on the Native Americans and the Ice Age - it took her nine years to write the first novel in this series. Harrison blends the story of families with strong women, men who were seal, whale, and walrus hunters with the harsh environment in which they lived at the frozen top of the world. I especially liked the author's very detailed descriptions of the Native American's use of every bit of what they had on the islands to make their food, shelters, and clothing. Absolutely nothing was wasted from the fish, seals, walrus and whales. This would be an excellent series to use as a teaching tool for middle to high school age students.