What do you believe is true even though you can't prove it?

Edge this year asked the question "What do you believe is true even though you cannot prove it?" to 120 of the worlds 'most complex and sophisticated minds' - and there really are some impressive names on the list. One of the things that I believe is true but cannot prove is that the rise of the blog is demonstrative of the fact that people need to talk more than they need to be heard. I feel this supports my long held view that most documentation is written to be written not to be read. I won't attempt to explain them because I believe they are true and I will try to fight the need.