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Old 17th November 2012 | 15:11
  #266 (permalink)  
Lyman
 
Joined: Aug 2011
Posts: 2,074
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From: Grassy Valley
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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