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The Big Bang and Quantum Mechanics Explained
An unmelted ice cube is lower entrope, which means there are far fewer ways to arrange water molecules in a glass of water. The chance that any one of those ice cubes would unmelt is very, much, much longer than the age of the universe. If it weren't for that boundary condition either, depending on what else you conditionalize on? Either there just wouldn't be any ice cubes in the universe.