"It had long been suspected that the egg came first, but now we have the scientific proof that shows that in fact the chicken came first," says Dr Colin Freeman, from Sheffield University. Here's the explanation:
When scientists from Sheffield University and Warwick University used a supercomputer called HECToR to take a close look at egg shells, they discovered that a protein "called ovocledidin-17 (OC-17) acts as a catalyst to speed up the development of the shell". They realised that this protein is crucial to actually forming an egg shell. They also realised that this protein is found in a chicken's ovaries. Based on this, these scientists decided that the chicken must have come before the egg.
Photo by Thomas Pix