LogFAQs > #902098615

Because grouping things is a fundamental part of how our brains keep track of multiple objects at once. Consider phone numbers: trying to remember 10+ distinct digits is extremely difficult, but when you break them up into 3-4 character segments it becomes much easier. It's a very handy trick that allows us to comprehend concepts on a scale beyond our raw mental capacity, but it's a rough approximation and can cause problems in situations that call for more nuance.
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And with that...pow! I'm gone!