There is no greater miracle in all of biology than the nine-month journey that begins with a fertilized egg and culminates in the birth of a tiny human being. From the moment the egg and sperm unite, an ancient and astonishingly intricate ballet unfolds. The still microscopic sphere divides into two, then four, then eight parts. Soon after, individual cells begin an extraordinary trek across this globe of living matter. Some dive deep into the core, where < they give rise to the intestinal tract. Others bunch along the surface, forming a hollow tube -- one end of which buds into...
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