Calculus.
...with a number of additional and complex real-time perturbations. It makes me realize just how powerful our cognition and problem-solving skills are.
For me, the process illuminates God's creative power. This is just one more example. So much of we we "invent" comes directly from a better understanding of what was created.
A better understanding of how I catch a baseball (or try, really) could help us to defend ourselves against enemy attacks.
I love this.