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So everyone is giving Ben Carson a hard time for coming in broken and stupid, but a sense of fairness impels me to make three points in defense of his Pyramids-are-Joseph's-Granaries, Scientists-credit-them-to-aliens thesis:
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1. Teach the controversy!
2. The pyramids have settled substantially, even since 1676. It is perfectly feasible that they were largely hollow when originally constructed.
3. Perhaps they did hold food reserves, just in a more concentrated form than grain.
Helen Altman doin it rong
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In fact the first granaries were built in the shape of giant upturned skulls, and called "brainaries".