Here's yet another explanation on how viruses mutate and create variants. There’s this idea that because most RNA viruses cannot error correct, they make lots and lots of mistakes. That’s not great for us, because it allows them to mutate rapidly and avoid the immune system. But if they make too many mistakes, it’s not good for the virus either, because the viruses will just break down. And when the replication does make a mistake and it’s not caught by the error correction, will the resulting virus be more successful or less successful? There are three possibilities—mutations can do nothing, they can impair the virus, or they can facilitate the virus replication. If the virus transmits better, then it will more likely be selected [through evolution] to be dominant. If the virus transmits at the same rate, it’ll still transmit, but if it’s worse at transmitting, it’ll get lost. We’ve seen in the pandemic that mutations have arisen and then they became really widespread and for almost all of the ones we hear about, it became clear that they have at least slightly better transmission. I don’t think it even has to be dramatically better. It just has to have a slight advantage over the original virus. I'm sure the ignorant will find this funny too. But then the ignorant also find information too difficult for them to understand funny as a defense mechanism. Laugh at something, and it loses power to the person laughing. Of course, to the intelligent that actually understands, the ignorance is the lowest form of stupidity, and the laughter is just confirmation of said ignorance.