Most people do imagine alien as the little green man with big black eyes, large head flying in a spaceship. Many paranormal movies about aliens have been using the classical physical appearance of alien which has similar physical characteristics to human. However, one would wonder if aliens are really look like human or if they are dependent to carbon and water for them to live. What if these aliens are not carbon-based being and that they are silicone-based creatures from a planet that is rich in sulphuric-acid?
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