Stewart: '“Whatever the reasons, mathematics is a useful way to think about nature. What does it want to tell us about the patterns we observe? There are many answers. We want to understand how they happen; to understand why they happen, which is different; to organize the underlying patterns and regularities in the most satisfying way; to predict how nature will behave; to control nature for our own ends; to make practical use of what we have learned about our world. Mathematics helps us to do all these things, and often, it is indispensable.”'