I was lucky enough to know exactly what I wanted to do when I was growing up. I think one of the hardest things to figure out in life is what your calling is, and what truly makes you happy - not what you want to work at, but what you want to do.
The first stage in a technology's advance is that it'll fall below a critical price. After it falls below a critical price, it will tend, if it's successful, to rise above a critical mass, a penetration.
This is why the ultimate reason of things must lie in a necessary substance, in which the differentiation of the changes only exists eminently as in their source; and this is what we call God.