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

Most over-the-counter sprays only treat what you can see. They rarely address nests or hidden entry points.”— Brittany ...

Octopuses are the undisputed kings of camouflage. Whereas engineers have learned to mimic the colors, octopuses also match the texture, disappearing into the background with a level of sophistication ...