How to conceive a child

It is safe to say: how not to conceive a child, modern science, in principle, is known. But what is happening or does not conceive, the birth of life is happening, remains a mystery that no laureate of the Nobel Prize has not solved. I did not have a practical interest in the process of artificial human reproduction. Among the three hundred thousand living on the Earth, there are no children from the test tube. But the main secret of life, seen through the magic crystal of the newest biotechnology, seemed to me incredibly exciting! Why is a completely healthy couple "can"t get? Are full-fledged children from frozen embryos born? Is it possible "with a guarantee" to conceive a boy Il and a girl? Not only doctors, but also close friends who knew the problem on personal experience were told to me in detail