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We examine the spinning behavior of egg-shaped axisymmetric bodies whosecross sections are described by several oval curves similar to real eggs withthin and fat ends. We use the gyroscopic balance condition of Moffatt andShimomura and analyze the slip velocity of the bodies at the point of contactas a function of $\theta$, the angle between the axis of symmetry and thevertical axis, and find the existence of the critical angle $\theta_c$. Whenthe bodies are spun with an initial angle $\theta_{\rm initial}>\theta_c$,$\theta$ will increase to $\pi$, implying that the body will spin at the thinend. Alternatively, if $\theta_{\rm initial}<\theta_c$, then $\theta$ willdecrease. For some oval curves, $\theta$ will reduce to 0 and the correspondingbodies will spin at the fat end. For other oval curves, a fixed point at$\theta_f$ is predicted, where $0 <\theta_f< \theta_c$. Then the bodies willspin not at the fat end, but at a new stable point with $\theta_f$. Theempirical fact that eggs more often spin at the fat than at the thin end isexplained.Comment: 14 pages, 14 figures, to be published in American Journal of Physic

Spinning eggs—which end will rise?