User:Fountains of Bryn Mawr
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Mister Fountains -- How does one embed a reference inside of a reference? I feel a need to reference umbilics inside of this reference:  Thanks.
- http://www.chacha.com/question/what-are-the-properties-of-spheres? All points of a sphere are umbilics. At any point on a surface a normal direction is at right angles to the surface. In the case a sphere these are the lines radiating out from the center of the sphere.