Happy National Ice Cream Sandwich Day.

Thanks to science, many if not most good ice cream sandwiches won't melt when exposed to heat, to prevent people from getting gooey hands. A mix of calcium sulfate and guar gum keeps the ice cream together, even when exposed to warm hands to hot temperatures.

http://www.geek.com/science/why-ice-cream-sandwiches-dont-melt-and-why-thats-ok-1600669/

http://www.snopes.com/food/ingredient/walmarticecream.asp