The quantum coin toss

All unpredictability in the world around us, be it the outcome of a coin flip or the weather conditions a month from now, is a fundamentally quantum rather than classical phenomenon. This is the conclusion of two physicists in the US, who have worked out that molecular interactions in gases and liquids can amplify tiny quantum fluctuations, to the point where the fluctuations are large enough to account for the uncertainties we experience at the macroscopic scale. This insight, they argue, could prove important in cosmology, as it might rule out some theories of the multiverse that rely on classical as opposed to quantum probabilities.