- Involve your child in your life. Cooking, cleaning, running errands, fixing the toilet, looking after little siblings, working in the garden.
- Talk. Just natter on about interesting things. Listen to the questions he asks and ponder them aloud with him. Share your thoughts and experiences.
- Be an interesting person. Model being a curious, impassioned life-learner yourself. Pursue your own interests.
- Strew around your home a few interesting resources that you think might interest him. Don't get yourself attached to the idea of him doing anything with them, but put them out there. Watch to see what catches his interest. Strew more of that sort of thing.
- Read aloud to him. Visit the library. Choose books that are at a level beyond what he would likely read to himself and read for at least 45 minutes a day. Historical and cultural fiction are a great way to spark new interests.
- Don't assume he won't want to do sit-down bookwork, but make this completely optional and be flexible about the level.
That's about it: facilitate, support, include, talk, model.