[kergonath]

> We don't evolve anymore. Natural selection doesn't happen anymore.

Of course we do. Why would we not? Evolution is just a fact of life. For it to stop happening, we’d need all humans to have strictly the same number of children who live long enough to have children themselves. As soon as you have something affecting fertility rates, you have selection pressure.

> particles and radiation in space affecting DNA for one

What makes you think this does not happen on Earth? Radiation is everywhere. So is chemistry: there are more ways to alter DNA. On top of that, DNA has intrinsic mechanisms for mutation, in the form of transcription errors. Mutations happen all the time.

[AnimalMuppet]

Well, evolution doesn't happen nearly as much based on disease resistance, now that we have antibiotics. It doesn't happen nearly as much based on ability to survive famine, now that we have modern agriculture. It doesn't happen nearly so much based on ability to survive childbirth, now that we have hospitals. And so on.

That may have been their point.