Observation and NOT reading is the key to intelligence.
You can observe anywhere and every where. You can learn something from anyone.Everyone has some nuggets of wisdom which they acquire through their whole life. To acquire one nugget of wisdom, one may take a lifetime. Ask them, observe them, learn from them.
You know who are the best people from whom you never learn anything great ? They are your parents. We take them for granted. Ask you father about his experiences and you might be amazed by their experiences. Parents never consider the fact that their little ones are grown up and they might need some wisdom!
Also consider your watch man, lift man, your taxi driver and whom ever you know. They all have those nuggets, grab them.
Every one is a book and everybody has a story.