My good friend Karen was very interested as to why the BGE has dimples. Being a brilliant nurse herself, her father was a scientist, she felt there must be a reason for it. This was a previous post. She had gone to Speidie Fest last weekend in Binghamton NY (our home town) and asked a man who was selling the Eggs there abt the dimple theory.
His reply to her was: "the dimples were used to increase the surface area of the outside to contain the heat inside".