Which Came First - The Chicken or the Egg ?

One of the most puzzling and famous life questions has stumped people for generations. It's the question of which came first: the chicken or the egg? In order for there to be an egg, a chicken would have had to lay it. In order for there to be a chicken, it would have had to hatch from an egg.

Dr. Colin Freeman from Sheffield University along with colleagues from Warwick University have figured it all out. Their research project originally aimed to figure out how animals make eggshells because it's an extraordinarily strong yet lightweight material that no human has been able to replicate, and the researchers hoped to learn how to develop a manmade equivalent by learning about the way animals make eggshells.


Chickens were chosen as their test subjects simply because the protein was easy to study. The study began when Freeman and his colleagues used the UK Science Research Council's super-computer called HECToR (High End Computing Terascale Resource), which is based in Edinburgh. The "ingredients" used to make eggshells were programmed into HECToR, and that was it. The computer was left to produce results on its own, and it took weeks for HECToR to figure out how chickens make eggshells.

When HECToR finally arrived at a conclusion, the researchers were stunned when they realized that they had solved the age old question. After years and years of debate, it was finally determined that the chicken came before the egg.

What they found was a protein, called ovocledidin-17 (OC-17), that exists only in a chicken's ovaries and is vital to eggshell formation in chickens. The protein acts as an ongoing builder that pieces microscopic parts of the shell together by converting calcium carbonate into calcite crystals. The shell would not exist without this protein, which only exists in chickens, so the end result is that the chicken came first.


In addition to answering the question that has burdened the human race for ages, the results of this study could be advantageous in the medical field since human bones and teeth are made in a similar way as eggshells. This could lead to a better understanding of how to rebuild human bones. Also, the study could help figure out how crystal structures can be made and destroyed (since the eggshells are made up of microscopic crystals). Learning how this can be done could lead to the elimination of limescale crystals on pipes and kettles.

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