One of the less-talked-about side effects of being blind: fielding many (many!) questions from us sighted folks -- enough questions, apparently, to program a YouTube channel. Tommy Edison, who is blind, hosts the popular YouTube series "The Tommy Edison Experience," where he answers viewer questions: How do blind people use an ATM? How do blind people use paper money? In one of his latest videos, he posts his answer to a fascinating question: How do blind people dream?