This was part of a posting on Cosmic Variance blog (see links):
What is the arrow of time? http://cosmicvariance.com/2007/12/03/arrow-of-time-faq/
The past is different from the future. One of the most obvious features of the macroscopic world is irreversibility: heat doesn't flow spontaneously from cold objects to hot ones, we can turn eggs into omelets but not omelets into eggs, ice cubes melt in warm water but glasses of water don't spontaneously give rise to ice cubes. These irreversibilities are summarized by the Second law of thermodynamics: the entropy of a closed system will (practically) never decrease into the future.
What do you think?
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