Can we turn an asteroid into a space-station?

Why does a local anaesthetic make my face feel fat? How do worms get into food? Would a taxi driver find a map of a new city easier to learn? From where did the asteroid belt form? Why is the lower lip more prone to chaps? What makes birds decide to sing at 5am? Can we make a spacestation inside an asteroid? Do you believe in UFOs? Another crop of top questions from 702 listeners gets answered...