These books are money well spent, especially in today's school climate of social activist indoctrination. My children range in ages from 5-10 and they all enjoy the Tuttle Twins line of books. We have even given the set as gifts, and they are always well received. If you want to raise well rounded, socially respectable individuals you cannot go wrong with the Tuttle Twins. We love them so much we even became investors in the cartoon series. Keep up the great works Tuttle Twins!