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Ever use the saying "Once in a Blue Moon"? I didn`t know it actually exist. Have some fun once in a blue moon tomorrow! I`ve always thought if the saying was true, there will really be a blue moon. It`s actually just two full moons in the same month and happens not very often, something like once every 2.7 years. If you were to meet up with your friends once in a blue moon, it`d better be once every 2.7 months.
Source link: http://ablissfulliving.blogspot.sg/