Neanderthals used antibiotics, new experiment suggests

Gooey birch tar helped our distant cousins make weapons and possibly treat wounds. The bark of birch trees has been used to produce tar for more than 150,000 years. The center photo shows birch bark tar condensed onto a rock that borders a hearth. When scraped off the rocks, the viscous tar can be used as both an adhesive and antibiotic. Breakthroughs, discoveries, and DIY tips sent six days a week.