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Gophers might be destructive in your yard, but scientists found that they have the opposite effect in recovering ecosystems. Mount St. Helens is a volcano in Washington state. It erupted in 1980 and destroyed miles ... Read more -
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Labor Day is a holiday [a day when schools and businesses close]. It celebrates American workers. Schools close for Labor Day. Labor unions suggested Labor Day. Labor unions are groups of workers. They make sure ... Read more -
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