Chewing gum is a soft, flavored confectionery designed for maximum adherence to minivan carpets. It is also used for freshening breath, blowing bubbles, popping bubbles in order to annoy coworkers, and for reminding smokers that their doctor was right: nicotine is really addictive.

Tree sap vs.Manilkara zapota van Royen

The first gum chewers voluntarily put into their faces the same thing that sticks to our hands for a week after putting up a Christmas tree.

Varieties of substances have been c...