Today was another of my periodic sleepy days, and I spent much of it napping. I did work on calculus for an hour in the evening, and I listened to A Brief History of Mathematics for another half hour or so. Both the calculus exercises and the radio programs emphasized the usefulness of mathematics to natural science. That’s not really something I think about much. For me, the appeal of math is very much inherent in the subject, not tied to what you can do with it. I am glad other people are interested in the latter, though.
One part that you love is the beauty
Yes, and I do find that more in the development of concepts than in their application.