Language and radio signals may not matter to aliens. Instead, they might be using patterns to leave a biological fingerprint.

British beaches have all the usual suspects like shells, seaweed, and maybe the odd crab scuttling for cover. But look a little closer, and the shoreline starts to feel more like another planet.

Aliens could be chatting with each other in plain sight using light flashes like fireflies, scientists say - Alien signals may not have inherent meaning, but just meant to stand out against cosmic bac ...