Because it is more likely that they will spin than they won’t spin. That’s it, just statistics.
Think of pouring milk into coffee, it makes those swirl patterns. Is it possible that you could pour the milk in perfectly straight so that every molecule of milk hits every molecule of coffee perfectly dead-on? I guess. But it’s WAY more likely that milk molecules will hit coffee molecules off-center, with like a glancing blow, causing them to spin.
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