In this Friday, Oct. 19, 2012 photo, geoscientist Fred Paillet, an emeritus professor at the University of Arkansas who has studied chestnuts for nearly a half century, listens to a spe

 

              In this Friday, Oct. 19, 2012 photo, geoscientist Fred Paillet, an emeritus professor at the University of Arkansas who has studied chestnuts for nearly a half century, listens to a spe
In this Friday, Oct. 19, 2012 photo, geoscientist Fred Paillet, an emeritus professor at the University of Arkansas who has studied chestnuts for nearly a half century, listens to a speaker during the American Chestnut Summit in Asheville, N.C. After 30 years of breeding and crossbreeding, scientists have developed a potentially blight-resistant tree. (AP Photo/Allen Breed)