Last May, two research groups announced a breakthrough: they each grew human embryos, in the lab, longer than ever before. In doing so, they witnessed a period of human development no one had ever seen. But in the process, they crashed up against something called the ’14-day rule,’ a guideline set over 30 years ago that dictates what we do, and possibly how we feel, about human embryos in the lab.
This piece was produced by Molly Webster and Annie McEwen, with help from Matt Kielty.
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