Pierced sticks are a strange stone age tool first found 150 years ago. Now, archaeologists are finally starting to figure out what they were used for.
Researchers have found the oldest known Australopithecus spine, dating to a whopping 4.2 million years ago. It sheds light on the evolution of bipedalism.
Modern humans have the lowest sexual dimorphism in primates. However, it turns out this was likely recent and was much higher in Australopithecus.