What do you believe that you cannot prove?

Each year, the Edge World Question Center posts a question to over one hundred eminent scientists and thinkers in the world. This year's question is "What do you believe that you cannot prove?"

The responses are a series of essays, written by such greats as author Ian McEwan, Jared Diamond, neuroscientist Steven Pinker, and biologist Lynn Margulis, and they run the gamut in terms of content. Some of the things these great minds believe but cannot prove:

• "I believe in the creative power of boredom."
• "I believe, first, that all people have the same fundamental concepts, values, concerns, and commitments, despite our diverse languages, religions, social practices, and expressed beliefs."
• "We will find ways to circumvent the speed of light as a limit on the communication of information."
• "I'm convinced, but can't yet prove, that humans first reached the continents of North America, South America, and Australia only very recently, at or near the end of the last Ice Age. Specifically, I'm convinced that they reached North America around 14,000 years ago, South America around 13,500 years ago, and Australia and New Guinea around 46,000 years ago; and that humans were then responsible for the extinctions of most of the big animals of those continents within a few centuries of those dates; and that scientists will accept this conclusion sooner and less reluctantly for Australia and New Guinea than for North and South America."
• "It is possible to live happily and morally without believing in free will."

Definitely some stuff in there worth considering. And definitely an excellent way to kill some time. I highly recommend a read.

But once you are done, I pose the same question to you. What do you believe that you can't prove?