What are the best ways to raise smart kids?

Only if anyone knew the trick. All you can do is teach your child to be honest, compassionate, loveable and forgiving. If his basic values are right, he anyway is going to be a smart kid. World needs love and tolerance the most. Education and degrees will anyway follow. Focus on him being a good human being, and this is the smartest thing that he would learn.

Keep them updated with what's happening in the world. Play lots of recreational activities with them. Raise their IQ levels by playing games that have reasoning and logic. Take them outdoors and expose them to their surroundings and let them handle situations practically rather than the theoretical way.