Scientists at the Weizmann Institute in Israel have developed Human embryo-like structures using embryonic stem cells, without the need for sperm, eggs, or fertilization. The research, published in the journal Nature, has potential for studying miscarriage and birth defects but raises ethical concerns. The models resemble early embryos and are similar to real human embryos, making them more useful for research into conditions such as infertility and birth defects. The researchers did not go beyond the legal limit of 14 days for human embryo lab research, and the models should not be considered human embryos.

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