The team has been investigating findings from an ancient rock shelter at a site named Takarkori in south-western Libya. It is desert now, but earlier in the Holocene age [our present age], some 10,000 years ago, it was part of the "green Sahara" and wild cereals grew there. More than 200,000 seeds - in small circular concentrations - were discovered at Takarkori, which showed that hunter-gatherers developed an early form of agriculture by harvesting and storing crops. But an alternative possibility was that ants, which are capable of moving seeds, had been responsible for the concentrations...The site has yielded other...