Researchers from the University of Manchester and the NHS Foundation Trust, University of Manchester, conducted in vitro research that revealed a new way for human embryos to communicate with their future mother after just six days of development. The study also showed that embryos can detect foreign cells in their environment, including pathogens. Thanks to these results, it is possible to achieve great success in fertility problems, help with natural conception and improve the methods of in vitro fertilization. So this research can be called revolutionary and in the future it may reveal the problem of infertility.