You can dive pretty deep into sports: strategy, execution, training, statistics etc...
You can dive pretty deep into kids: educational, behavioral, development etc...
You can dive pretty deep into wine: flavors, style, type, region, economics, science.
You can dive pretty deep into religion, especially if you are interested in the "examined" life. A bunch of philosophers did this, one famous example is Nietzsche.
Make it a challenge to find out one interesting thing about every new person you meet.
You can dive pretty deep into kids: educational, behavioral, development etc...
You can dive pretty deep into wine: flavors, style, type, region, economics, science.
You can dive pretty deep into religion, especially if you are interested in the "examined" life. A bunch of philosophers did this, one famous example is Nietzsche.
Make it a challenge to find out one interesting thing about every new person you meet.