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The National Children's Museum in Oxon Hill, Md., is launching its Trader Center this weekend, where your child can bring the rocks he or she has discovered, and trade them for better rocks. They can also learn about bartering, which is another lesson that may very well save parents a fortune.

The National Children's Museum in Oxon Hill, Md., is launching its Trader Center this weekend, where your child can bring the rocks he or she has discovered, and trade them for better rocks. They can also learn about bartering, which is another lesson that may very well save parents a fortune.

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