What books have you read about it from? And what level of explanation will you be able to grasp (ie, are you a 3-year-old or a 30-year-old with a PhD in Atomic Physics) ?
You are expecting a whole lot of divination out us!
Relating to your message, van de waal's forces of attraction simply refers to the forces between the molecules.
Your question of water droplets not dropping straightaway is due to the surface tension theory. For more info on it, jus go google.com and type in surface tension theory and u'll get like 20 sites.