Buried grapes in the research vineyards at Cornell Orchards, Ithaca, NY (left) and grapes more fully exposed to the sun at Peconic Bay Winery, Peconic, NY (right) By Tom Mansell, Science Editor As I checked my Twitter feed over the past few days, I noticed lots of tweets about the upcoming harvest from winemakers and growers.  See the following from Lucas Vineyards winemaker Jeff Houck and Fox Run Vineyards owner Scott Osborn: Apparently many places are doing some post-verasion leaf removal, as recently discussed on this site. It got me thinking about what's actually happening inside the grape when all…