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They say pictures say a thousand word's, well this one speaks MILLION'S.
A smile is an emotion and is controlled by facial muscles, which in turn those muscles are controlled by the brain, which in turn the brain is activated by both internal and external stimuli and by all accounts brain activity signifies life.
People always say; "I have to see it to believe it", so there ya' have it, seeing is believing,,,,,
Life Begins in the Womb!