Chicken or egg

Professor Brookfield said: "The first living thing which we could say unequivocally was a member of the species would be this first egg, so I would conclude that the egg came first."

Do we really want to know that the egg came before the chicken, or do we just enjoy the puzzle?

But now we can wonder what eggs and kangaroos have in common?

"If a kangaroo laid an egg from which an ostrich hatched, that would surely be an ostrich egg, not a kangaroo egg," he added.

Or maybe we just need to find our own favourite fact among "100 things we didn't know last year"

Bring on 2007!