> You can never know in advance what you will need, and chance favors the prepared mind. I agree with you fully. It's surprising how useful things from unrelat

> You can never know in advance what you will need, and chance favors the prepared mind. I agree with you fully. It's surprising how useful things from unrelated fields can be. Just as an example, taking a course on economics taught me about utility functions, and decision theory. The decision theory stuff became really useful when I started learning Machine Learning; for example picking from a set of competing models using decision theory to think about the costs and benefits.