Ancient Greeks didn't kill 'weak' babies
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belief used to justify atrocities (Nazi eugenetics) 
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study published in Hesperia disagrees Greeks actually did this - Plutarco was writing about events that took place 700 years before he was born
 
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archeological evidence of death pits filled with babies, consistent with high infant mortality non selective infaticide 
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findings of adults with anomalous limbs or disabilities