LOL, it shows your weak position, you believe that the human brain developed without experiments,
without research, without analyzing and without careful checking and still talking about science,
you're really dishonest.
Wow! No, why do you think that experiments needed to be done? You clearly have no clue as to what you are arguing against nor do you understand the scientific method. Instead of constantly shooting yourself in the foot and making obviously false claims about me why don't you try to learn?
Once again, evolution is a process. There is no goal in evolution. You were not a goal, you are merely a result. The intelligence that we have was not a goal, it was merely a result.
And nature does not experiment, nor does it need to. Let me try to help you. Once you understand to concepts you should be able to understand how evolution occurs.
The first concept is variation. There are multiple sources of variation. It does not only come from only random mutations. If you understand statistics at all and how life varies you will see that there will be a range of traits that will appear. No "luck" needed. With any sufficiently large enough population there will be a range in strength, intelligence, resistance to disease, etc..
The second concept is natural selection. The life that is most successful in bringing their offspring to the age of reproduction and having them successfully reproduce are going to be the ones that we see. Variations that help in a particular environment will be passed on. Variations that do not help will die off. Remember, "stronger" is not always better. Strength takes more energy than a lack of strength, at times excessive strength is a negative trait and will not be passed on to the next generation, it will die out. Positive traits are environment specific. Natural selection will "choose" the life that is best suited to a particular environment.
Between the two life will evolve. Now if you want to you can think of every single new organism as an "experiment". It is not since there is no intent, but the results are very similar to if one tried to breed specific traits. But just because something looks like it might have been designed does not make that the case. A snowflake looks "designed". We know how and why they grow as they do, no designer needed. The same applies to life.