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IMAGE: The butter sculpture at this year's Pennsylvania Farm Show depicts a National Guardsman saying goodbye to his family. The butter will be used to make biodiesel at the end of the show.

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Credit: PA Department of Agriculture
Description: The butter sculpture at this year's Pennsylvania Farm Show depicts a National Guardsman saying goodbye to his family. The butter will be used to make biodiesel at the end of the show.

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VIEW IMAGE: The butter sculpture at this year's Pennsylvania Farm Show depicts a National Guardsman saying goodbye to his family. The butter will be used to make biodiesel at the end of the show. VIEW IMAGE: Waste coffee grounds can provide a cheap, abundant source of biodiesel fuel (shown), researchers say.
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