When did humans decide it was a great idea to start hacking each other to pieces? The birth of human warfare is a contentious issue. In the past, archaeologists have argued that hunter-gatherers were too busy trying to survive to fight each other. The discovery of a 10,000-year-old mass grave in northern Kenya throws that theory into question. 

BBC News reports:

"Archaeologists say they have unearthed the earliest evidence of warfare between hunter-gatherers to be scientifically dated, at a remote site in northern Kenya. The 10,000-year-old remains of 27 people found west of Lake Turkana show that they met violent deaths. They were left to die there rather than being buried. The archaeologists, who have been working on the site at Nataruk since 2012, discovered that the victims were clubbed or stabbed to death in a single event."

Want to know more about the discovery? You can read the whole story over at BBC News