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There are many benefits to timing your practice, including:
0^0 is undefined by mathematical convention. The reason is that it is suspect to logical contradiction. Take any number to the power of 0 and you get 1. Therefore, 0^0 = 1 by that logic, but that's just weird since the base is 0. This issue is still being debated, but for now the convention is that 0^0 is underfined (by convention only).