@Kelly_Obrien… you are correct, we can know either an electron’s position or velocity, but not both. Scientists use to believe that they could mentally “stand outside” of reality and view the results of experiments without having any effect on the outcome of those experiments. With the advent of quantum mechanics, however, we learned that we cannot in fact, separate the observer ( scientist ) from the thing being observed… the very act of making an observation changes the outcome… pinning down the position of an electron will alter the speed, thus making it impossible to know both speed and position at the same time.