In this March 4, 2011 photo, Peter Purinton puts a ...

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Toby Talbot | published: March 7, 2011

In this March 4, 2011 photo, Peter Purinton puts a check valve tap into a maple tree in Huntington, Vt. The device was developed by maple researchers at the University of Vermont as a means of extending the six-week sugaring season. (AP Photo/Toby Talbot)



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