Is human evolution over?

That's the goofiest thing I ever heard. Evolution never ends. Most mutations are harmful - by far. What guides evolution is this very mysterious thing - call it supra-intelligence, or God, or, if you like chance. An example is an experiment in which a certain bacteria was grown in a petri dish containing nutriet A, but would not grow on nutrient B. Put some of the bacteria in nutrient B, and most of it dies, but a very small amount, perhaps only a few organisms, do somehow begin to digest nutrient B. After a while, there is a new, mutated form of the bacteria consuming that looks like the original bacteria, but can consume both nutrients. Human beings have evolved in this way too - for instance, Japanese are on average much better at extracting calcium from plants, as they did not traditionally have much milk in their diet. Northern Europeans and some Africans need to get a lot of calcium in their diet, because cows were a part of their culture, and their bodies lost efficiency at extracting calcium from plants. There are a lot of examples like this, which is why diet is such at individualized thing.

My current theory is that we can be directed from within ourselves, by conscious thought, choice, and biological programming, but that we also have the capacity to be "inspired" or to physically adapt when extreme pressure from the outside environment is present. Not everyone adapts. Conditions permitting, enough do. I like Gerhard de Chardin's concept of an oonasphere, although it has been many years since I read him.