BBC Science Focus writes that historically, gum was made from the chewy sap of the Sapodilla tree. However nowadays, they say, most companies use a substance called polyisobutylene. That’s the ...

Because it's gum. Duh. Gum has been around for much longer than you'd think. Ancient Mayans and Aztecs harvested resin from the Sapodilla tree. They would dry it into a 'cha', and chewed it to ...