“You have just tried a crunchy handful of one of Dave Arnold’s edible experiments – homemade pork rinds that taste like fatty Cracker Jacks – and now you’d like something to wash it down with.” So the up-and-coming star of molecular gastronomy shoots some CO2 and nitrous oxide into a bottle of tap water “and hands over a homemade carbonated water that is soft, creamy, and sweet.”