Does this "still" mean "but" or "another instance or group of"?
33)Thinking is hard work. If you do not keep your working memory clear, then you are weakening your ability to think about what is going on in your class or meeting. This might seem obvious, but if you look around the room at many meetings, you will find yourself face-to-face with one of the true demons of modern life: multitasking. Sitting in a meeting,you will see that some people are taking care of work that is unrelated to the current meeting. Others are checking their e-mail. Still others are reading. Each of these activities takes up your working memory...