How to become Smarter?

A flight attendant once answered beautifully on ‘what separates a business class passenger from a economy class passenger?

Attendant replied when I am in economy class doing my job of helping people all I can see is people talking to person next to them, playing games, listening to music, doing something random in their mobile phones or simply sleeping.

But when I am in the business class. I see most of the people doing one activity and one activity alone which is

Reading a Book