Washington (AFP) – Big and scary-looking Joro spiders have spread from Asia to the southern United States and are now poised to colonize the country’s cooler climes — but they’re nothing to fear and might end up actually helping local ecosystems. That’s according to scientists who have been studying the arachnid invaders since they first arrived in Georgia around 2013. In a few short years, the golden webs spun by the bright yellow, dark blue and red spiders — usually built at head height — have become a common sight throughout the state, and new research suggests they will clamber up the E…