Apple Juice Anyone?

Nathaniel has been coming up with a lot of interesting questions lately. For example, a couple days ago I got a succession of questions including "Dad, does space go for infinity?", and "Where does all the water in the world come from?" Then an easier question came, "Dad, how do we make apple juice?" (He'd recently learned how to squeeze oranges for orange juice). I explained that there a large machines that press the juice out of the apples. But he believed we could also suck out the juice with a straw, so I suggested we try it. He did, and it didn't work very well. So he ate the apple, and that was that. Now on to the other questions...