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At Audubon Nature Preschool in Chevy Chase, Md., a 鈥渃lassroom鈥� can be a pond, a bamboo forest, a meadow, or a garden. That鈥檚 because Audubon is a 鈥渘ature preschool鈥濃�攐ne of a growing number of preprimary schools around the country where children spend all or part of their days outdoors and in all kinds of weather.