Today practically all of us use computers, but hardly anyone knows how they really work. We shall explain the basic way a computer functions and shall even take a look at its deepest, innermost component, the so-called CPU (central processing unit). On this excursion into the heart of a computer, we shall meet transistors, the binary number system and logical building blocks, and shall even design and work with a so-called „full adder„. Finally, there will be a big challenge: you can try your hand at designing your own little computer chip at a multimedia station. If you succeed, you will be given a highly complex silicon chip which you can take ome.