Happened to me once outside San Angelo. Noticed the car behind turn their headlights off for a second, then they flipped their red and blues on. I was pulled over because my license plate lights were out, but I’m pretty sure they just wanted to see who was driving the shitty car with out of state plates through their town. No ticket, no warning, didn’t ask to search the car, just annoyingly nosey.

I’ve read that one, it was quite good.

This is an interesting idea. If neither biologies used the same fuel molecules then they wouldn’t compete for resources, but perhaps they would compete for space? But then if both biologies were that different from each other would they be able to even live in the same environment?