One of the great things of being part of the Electrical Engineering department at Princeton University is to have Loren Pfeiffer in the 4th floor (video and website). Loren is a materials grower that uses molecular beam epitaxy to grow the best single crystal gallium arsenide (GaAs) in the world. The materials that he grew were used in studies that led to the Physics Nobel prize in 1998. So, the best person in the world at something in this story is Loren Pfeiffer. I will write down about a conversation I had with him at the beginning of my third year. By that time I have had a couple of failed projects under my belt and I was seeking out for advice. To whom better to ask than to a person who is the best in world at something? Loren must be having an easy time with his experiments, I thought.