I went to medical school at one of the best in the country. I studied molecular biology and this movies science is spot on. For those that don't know the title Gattaca is made up of letters that are all nucleotides , the building blocks of DNA. That is kind of neat. And they never really advertise that. They don't mention that in the movie. You just have to kind of know what. Makes you feel special if you do know it. That's how I know the writer is a highly intelligent person and expect the audience to be intelligent also. They don't dumb it down for us.  I loved it. Five stars. I would give it six if I could.