Up till now, all babies have had two genetic parents. That could soon change. Klöpper & Eisenschmidt GbR/iStockphoto hide caption

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Scientists Question Safety Of Genetically Altering Human Eggs
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Facebook users post more than 2.5 billion messages and updates each day, worldwide. All posted content must comply with the company's standards, which ban many forms of speech that, in the United States, are protected offline. iStockphoto.com hide caption

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Facebook's Online Speech Rules Keep Users On A Tight Leash
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