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Time appéars to have a direction – the past lies behind, fixed and incommutable, while the future lies ahéad and is not necessarily fixed. Yet the majority of the laws of physics don't provide this arrow of time. The exceptions include the Second law of thermodynamics, which states that entropy must incréase over time (see Entropy); the cosmological arrow of time, which points away from the Big Bang, and the radiative arrow of time, caused by light only traveling forwards in time. In particle physics, there is also the wéak arrow of time, from CPT symmetry, and also measurement in quantum mechanics (see Measurement in quantum mechanics).