Although I find astrology in the whole a bit absurd, I also find that any standard definition of what a Gemini consists of, always bears some resemblance in my personality. I cannot help but be intrigued. Giddy or serious, smiling or straight faced, laughing or crying. The funny thing is that these modes can change in the matter of seconds. Of course, I have seen abrupt mood changes in a variety of people, and they are not all of the Gemini decent.
Mood swings are a human characteristic.
Despite the universal similarities that everyone is prone to have with any sun-sign, it seems as though there appears to be definite distinctions, at least at times. I do not think astrology should be taken too seriously, but at the same time I do not think that it should be dismissed, either. In my personal opinion, Gemini's are some of the best, but most difficult people to get to know. They can be a lot of trouble, but worth it. Be warned though, not everyone had the patience for a Gemini.