By Issam AHMED Scientists investigating how Antarctica’s ice sheets retreated in the deep past have turned to an innovative approach: studying the genes of octopuses that live in its chilly waters. A new analysis published Thursday in Science finds that geographically-isolated populations of the eight-limbed sea creatures mated freely around 125,000 years ago, signaling an ice-free corridor during a period when global temperatures were similar to today. The findings suggest the West Antarctic Ice Sheet […]