Air is an essential ingredient of ice cream.
Le Mars is the home of Blue Bunny and was named 'Ice Cream Capital of the World' by the Iowa legislature. The ice cream Sundae got it's name in my home town, Evanston, Illinois, home of the Methodist-founded Northwestern University, and the Women's Christian Temperance Union. A hundred years ago, the town leaders didn't care for the iffluence soda fountains had over the populous, keeping the faithful out of church on Sundays. The city city passed a law banning the sale of ice cream sodas on Sunday. An industrious soda jerk invented the Sunday Soda, containing ice cream and syrup, but no soda, thereby complying with the letter of the law.