You can buy a computer that knows everything about medical science. You need not go to a medical college; you simply ask the computer and immediately get the answer. Your memory is not so reliable. And the computer can always be fed with new memory, because new discoveries are being made every day. The computer can be plugged into the main computer of the university, so without your even bothering, every new discovery concerning your subject is immediately fed into your computer. It waits there, you inquire, and the computer tells you.