Over the last 150 years the average height of people in industrialized nations has increased approximately 10 centimeters (about four inches). This was not due to evolution, it was due to better nutrition, which enabled our genes to express themselves, to support increase height. But we will not see 15 foot people, because there are also genetic limitations.

200,000 years, look at how much people have grown in the last 50 due to nutrition.

Can you get that someone to provide us evidence to support their claim?

It's all evolution, trust the Learned on that.

Who the fuck cares, just accept and be happy !

First of all, the differences exist, so it happened. Evolution happens much more quickly than most people understand. There is a great book on this called something like the Beak of the Finch about how environmental conditions causes a very quick alteration in Beak shape that enables the finches to eat the local seeds on the Galopagos Islands. Undoubtedly, this happens and has happened many times in other areas. Scientists have experimented with domesticating minks in about 20 generations showing how dogs could have evolved their doglike behavior and skull shape. It doesn't require aliens or invisible friends in the sky for this to happen.

There are certainly unanswered questions about human evolution, but I don't think alien intervention helps to explain anything. I also think that evolution is not a 'slow and steady' process, but proceeds unevenly in response to environmental changes and interbreeding of sub-species.

Your informer is misinformed. Two or three hundred thousand years is plenty of time for what little diversity there is in Homo sapiens. It could have happened in half that time.

I've always been fascinated by the concept that we were genetically modified from some sort of ape like creature by aliens. I originally got this idea when I saw the movie 2001 Odyessy. It sounds plausible but of course unlikely. Or is it ?

I'd need to see good evidence on those claims.