Everyone knows how to make babies, and it isn't exactly molecular biology. However, after you do the deed, the whole process of actually creating a baby becomes much more complex. And this process is, literally, molecular biology.

Can you imagine how a sperm and egg that are so small they are almost invisible grow into a 7-pound baby? The process is delicate and incredible and part of being human.

Scientists have studied the way babies go from a fertilized egg to human being, and they have documented each step of the nine-month process. But, by far, the most remarkable changes occur before you even know you're pregnant.

After having sexual intercourse, your partner's sperm travels through the opening of your cervix and into your uterus. The sperm are making their way toward your fallopian tubes. Some of them will head to the left and some will head right, and because you only ovulate on one side each month, some of the sperm cells will head in the wrong direction.

It takes nearly half a day for the sperm cells to reach the fallopian tube. If there's an egg in one of the tubes and one of the sperm reaches it, then fertilization will occur. But if the sperm cells don't find an egg, they will die.

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