Are we what our molecules make us?

August 21, 2008 Are we what our molecules make us? Greg Freiherr -------------------------------------------------------------------------------- I've heard it since childhood: You either have chemistry with another person or not. PET imaging now is turning common sense into science. Using PET, researchers at Ludwig Maximilians-University in Munich have validated a long-held theory that individual personality traits are determined by chemistry in the brain's endorphin system.

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