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How are eggs of different shapes made, and why are they the shape they are? When does the shell of an egg harden? Why do some eggs contain two yolks? How are the colours and patterns of an eggshell created, and why do they vary? And which end of an egg is laid first – the blunt end or the pointy end? These are just some of the questions The Most Perfect Thing answers, as the journey of a bird’s egg from creation and fertilisation to its eventual hatching is examined, with current scientific knowledge placed within an historical context.