An NC state professor previously determined it's aluminum reacting with acid in the bees' stomachs: https://news.ycombinator.com/item?id=46501058 https://news.

An NC state professor previously determined it's aluminum reacting with acid in the bees' stomachs: https://news.ycombinator.com/item?id=46501058 https://news.ycombinator.com/item?id=46501058