> it only happened once -- which isn't what you'd expect from aliens hoping to make contact. Actually it’s exactly what we did with the Arecibo message, our on

> it only happened once -- which isn't what you'd expect from aliens hoping to make contact. Actually it’s exactly what we did with the Arecibo message, our only attempt to make contact. https://en.wikipedia.org/wiki/Arecibo_message https://en.wikipedia.org/wiki/Arecibo_message