Human evolution from a scientific stantpoint - Scientific debate, not a religious one

[m0u5y]

how can we evolve when the technology and medical discoveries we have come up with are hindering it. if you think about it, since we can cure so many desieses then the whole survival of the fittest cant work. if the "good" genes cannot be passed down and the "bad" ones are kept in the genetic pool then we can NEVER evolve, at least phisically. Now, mentally, that's another matter. we have been gaining knowledge, and for one you can say that our ways of life and the ways we apply the knowledge are evolving. we might be getting smarter and maybe that is the fated way humans have to go toward (even though ive noticed that kids now a days are getting dumber.) if we are evolving, we are doing so by losing teeth generation after generation, having genetic conflicts when interbreeding with people from different countries (as for example, im half italian and half american and my teeth dont fit in my jaw lol) getting weaker because our bodies are use to medicine working for them instead of their own immune system... no we didnt evolve from chimps, chimps and humans evolved from a common ansestor accorting to scientific findings. i mean hello, we have a common ansestor with bugs! people get confused because humans and chimps have a great deal of genetic info in common. the defenition of evolution is A gradual process in which something changes into a different and usually more complex or better form. it says better not worse. another factor involved is that humans will change the enviornment to suit their needs. if evolution occurs to adapt to the enviornment how can it happen when the enviornment is manipulated by humans?