A kitchen thermometer is essential for baking bread as it allows bakers to activate yeast at the proper temperature range of 100-110°F. Without a thermometer, one can use a piece of gum instead as gum softens at around 109°F, the ideal yeast activation point. Some are now joking that chewed gum could become a new form of currency if its value was set and trades could be made using gum, though gum is not a serious proposal to replace traditional currencies.