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2008 "days-in-a-week" debate on Bodybuilding.com forums
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Ideally I would wash my hair every five days or so, but because our weeks are seven-day long I wash them every seven days and deal with having slightly greasy hair for two days.
Sometimes I wish the Revolutionary calendar had worked out. It had 10-day-long décades instead of weeks; that would have been awesome for my hair.