From the book of Genesis: Gen 2:18-24 18 The LORD God said, "It is not good for the man to be alone. I will make a helper suitable for him." 19 Now the LORD God had formed out of the ground all the beasts of the field and all the birds of the air. He brought them to the man to see what he would name them; and whatever the man called each living creature, that was its name. 20 So the man gave names to all the livestock, the birds of the air and all the beasts of the field. But for Adam no suitable helper was found. 21 So the LORD God caused the man to fall into a deep sleep; and while he was sleeping, he took one of the man's ribs and closed up the place with flesh. 22 Then the LORD God made a woman from the rib he had taken out of the man, and he brought her to the man. 23 The man said, "This is now bone of my bones and flesh of my flesh; she shall be called 'woman,' for she was taken out of man." 24 For this reason a man will leave his father and mother and be united to his wife, and they will become one flesh. (NIV) The scientific basis for this passage is interesting. Humans [as well as other life forms] are made from carbon molecules. The field of Organic Chemistry is the study mainly of the Carbon atom as well as other atoms that bind to Carbon [such as Hydrogen, Nitrogen, and Oxygen]. But what is Adam's Rib? Is there a scientific basis for this? The answer is that what makes a man a man is testerone. What makes a woman a woman is the family of hormones known as estrogens. The estrogens have one less carbon rib than testerone has. The chemical formula of testerone is C19H28O2. The chemical formula of the estrogens is C18H24O2. Thus estrogens has one less carbon rib than testerone. Is this the scientific basis of this passage of Genesis? Possibly. It makes sense. Carbon compose the bones of living organisms. Maybe God showed us how we were made in a way we could understand thousands of years ago. And now we can understand the scientific explanation of the difference between man and woman -- the missing rib, or Adam's rib. Was this part of Genesis just a symbolic explanation, or was it an explanation that people could understand both thousands of years ago. Today the human race has a better understanding of science. http://www.freerepublic.com/focus/f-religion/2611620/posts I've found the study of the Hebraic Roots of "Rib" one of the more illuminating portions of Biblical study. As the writer points out, estrogen is the difference between a asexual child in the womb undergoing the process of sexual determination.