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Other Gemini traits include: adaptability, ingenuity and cleverness. They are a mental sign and therefore logical, even brilliant at times, possessing a great deal of charm. However, it is important to remember that the symbol for this sign is twins, and that not all twins are alike. There are broad distinctions within the Gemini character. In contrast to the shining one described above is the shadow twin. On the turn of a moment, Gemini can become cynical, biting, moody and quickly angered. Inseparable as two sides of a coin, those born in this sign can be dazzling and irresistible or inconstant and irrational.
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Geminis probably make better friends than they do lovers. They are entertaining companions and are more intrigued by the idea of love than the actual day to day involvement. Remember, what intrigues a Gemini is the unknown. Once something is familiar as an old pair of socks, the interest wears thin and the need for new worlds to investigate grows strong again. Geminis are fickle. This is not intentional, it is their basic nature to be so. Life seems too short a span to get very serious about anything for a Gemini. So, in love as in life, intensity of feeling is always fleeting. It is, while it is!

The Constellation of Gemini.Twelfth century European manuscript.

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Physically, Geminis have a youthful demeanor, sometimes childlike. Gemini rules the arms, shoulders, hands, lungs and nervous system. They generally have a sensitive nervous system, and don't fare well under too much stress. As Gemini considers danger about as seriously as they consider the rest of life, there is a need to restrain a sense of heroic invincibility.
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Origins in Mythology The constellation of Gemini has been seen as twin figures by cultures throughout the world, back into prehistory. The 'Two Stars', referring to its very bright suns, which the Greeks recognized as Castor and Polydeuces, were named for the younger and elder forms of the god Horus by the Egyptians. To the Romans they were Hercules and Apollo. Often perceived as twin boys, the lore sustains that they were placed in the night sky by Jove to honor and exemplify the fidelity of their brotherly love. In other instances they were seen as a sister and brother or two angels, then within later Christian traditions, as Adam and Eve.
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So Leda's twins, bright-shining, at their beck
Oft have delivered stricken barks from wreck.
—Horace