Illustration of a blastocyst, an early stage of an embryo
JUAN GAERTNER/SCIENCE PHOTO LIBRARY
From One Cell
Ben Stanger (W. W. Norton)
“WHERE do babies come from?” isn’t just a question some parents dread hearing from their children, but also one that has perplexed philosophers since the time of Ancient Greece. For anyone today, armed with the grasp of basic biology that was lacking in our forebears, it is hard to imagine how they could have even framed the problem. Once you know something, it is hard to unknow it.
To get around that conceptual …
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