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17th Nov 2012, 15:11

#266 (permalink)

Lyman

Join Date: Aug 2011

Location: Grassy Valley

Posts: 2,074

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Manhole covers are always round.

Nature hates a corner.

Viscosity.

Rate.

"if instead of fluid, the medium was ball bearings, would there be a vortex at the drain?"

Transition.

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