Scientist problems

Hi guys, i have been thinking to ask you this for a long time. But it is just me, or does anyone else have issues with the scientist work. I never get anything done when playing the scientist at work. I just get stuck, i do not seem to get all the options on thous machines to work so i can get what i need to bee done, done to go forward...so i end up with an ending saying, you could prestige better...It happened to many times so i lost interest in taking the scientist job as a job for any of my sims...So i only choose to bee a nurse or a cop, since that works better and i can get somewhere in that job...