What significant claim was associated with the return of a 31-year-old embryo?

The claim associated with the return of a 31-year-old embryo is significant because it marks the longest duration an embryo has been preserved before resulting in a successful birth. This case highlights advancements in reproductive technology and the possibilities that arise from long-term cryopreservation of embryos. Such a feat not only showcases the capabilities of current reproductive medicine but also raises discussions about the ethics and implications of preserving human life in this manner for extended periods. The achievement emphasizes the scientific milestones reached in the field, notably in the context of fertility treatments and the lifespan of frozen embryos.