We were all embryos, once; but we were all grown inside wombs. Researchers have now grown embryos in a lab. They stopped the trials at 13 days because regulations forbid research into human embryos after 14 days. While there are doubts about whether the biochemistry and physiology understanding is sufficient for the embryos to live longer, that may just be a matter of more research, except that such research runs into ethical and regulatory issues. This success is, however, an indication that it may some day be possible to grow a human. If a human grown in a lab developed normally, their existence would challenge many notions of the origin of consciousness, the influence of spirituality, and many of our social norms. Those topics are now less rhetorical.
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Brave New World.