In string theory, one of the many vibrational states of the string corresponds to the graviton, a quantum mechanical particle that carries gravitational force. Thus string theory is a theory of quantum gravity.
Their average web application development cost is around $500K and their staff or contractors' salary is in the six figure plus range. Their proposals are usually based on a lot of fluff with the development rate ranging from $400 - $800 per hour. These types of companies focus on custom development.
A friend of mine, a highly technical friend mind you, studied and literally took 6 weeks straight to build his companies website (he was managing the company at the time and has since graduated to president). At the time he was paid $25/hour. Much less than your average web developer.