David Guterson and his wife teach their three children at home. Guterson says that his children learn very differently from children in school: ________. For example, when there is heavy snowfall on a winter day, it may start a discussion or reading about climate, snow removal equipment, Alaska, polar bears （北极熊）, and winter tourism. A spring evening when the family is out watching the stars is a good time to ask questions about satellites and the space program.
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