lunedì 29 febbraio 2016

NYT Science: The Giving Tree, Giving Year After Year After ...

The Giving Tree, Giving Year After Year After ...
By C. CLAIBORNE RAY

A properly tapped maple tree can yield sugary sap over many seasons without any appreciable impact on life span, says one authority on the subject.

Published: March 1, 2016 at 06:00AM

via NYT Science http://ift.tt/1SbVRp0