A study published on Thursday claims that human ancestors teetered on the brink of extinction over 900,000 years ago. Based on a new method of analysis, scientists found that our ancestors survived in a group of less than 1,300 individuals. While most people nowadays worry about the overpopulation of planet Earth, which is currently hosting more than 8 billion individuals, our ancestors were facing a very different problem.Using a new technique to analyse genetic data, an international group of