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Leonard Susskind - We often say that the earth is a...
We often say that the earth is a sphere, but to be precise, the term sphere refers only to the surface. The correct mathematical term for the solid earth is a ball. (Leonard Susskind)

We often say that the earth is a sphere, but to be precise, the term sphere refers only to the surface. The correct mathematical term for the solid earth is a ball.

Leonard Susskind

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ball correct earth say solid sphere surface term

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