One of my current interest in passions, actually for a long time, is regarding stoicism, philosophy, etc.
Why? I think in the realm of philosophy, stoicism may be the only school of thought which actually is useful in every day living. For example, conquering fear doubt and hesitation, how to advance through setbacks, how to deal with other people etc.
I think ever since Nassim Taleb, stoicism has gained a new renaissance. Stoicism is now quite main stream, and interesting to a lot of people.