A signal from Proxima? Likely intelligent, unlikely from aliens

Astronomers looking for signs of alien life on other planets in the galaxy have found an unusual signal from Proxima Centauri, the nearest star to the Sun, that is... intriguing. It was just a single detection that came and went, but it does have some characteristics you'd expect from an intelligent source. The problem is, as it always is, that source may be us.

I want to be very clear here right off the bat, because The Internet: This is by no means proof that aliens are out there, or even (ye...