Our homeschool philosophy - education is not the filling of a bucket but the lighting of a fire - is usually attributed to Yeats but was (basically) Plutarch. We taught our kids how to learn and to enjoy learning stuff just to know it. We mostly did unit studies until high school level, spending however much time as they were interested in all kinds of subject, looking at all kinds of angles. For instance, if you like golf you can learn everything from physics to mechanical engineering to geography to history to botany. They are all still great researchers.