Embryo implantation is a still a "black box" as far as medical science is concerned, because we can't predict or control which embryos will implant. This is hardly surprising, given that it's a complex biological process, which involves an intricate interchange of......

One of the reasons IVF outcomes are so unpredictable and uncertain is because it's a complex biological system, and there are lots of factors which determine success. It's useful to think of these in terms of known factors ; and unknown factors . For exa......