Gemini, which is for those born between May 21st and June 21st, is the sign of the twins, and the duality of them shows in this sign. Gemini are natural talkers, eager to strike up conversation with passersby. Intellectually inclined and naturally curious, Gemini are interested in asking questions of others, making them the natural center of the party. They tend to be a perfect blend of yin and yang energies, allowing them to be great at seeing both sides of an argument. However, the downside of this sign is that you never know which half of the twin is going to show up in terms of their personality, and sometimes they themselves don't know that either. This can makes Geminis appear irresponsible and indecisive at times.