Got any gum? Prehistoric humans in Scandinavia chewed gum made from birch

(Natural News) More than 10,000 years ago, human settlers started populating the region that eventually became Scandinavia. Researchers at Stockholm University (Stockholm), the University of Oslo (UiO), and their partners have recently discovered that the ancient Scandinavians kept their teeth clean and healthy by collecting bark tar from birch trees and used the plant-based material as chewing gum. Once...