February 21, 2011

Off topic: 1 square inch of dirt

The dirt shown above collected on a north-facing windowsill when I left open slightly (no more than an inch) a window for 24 hours.  The center window was left open, but the dirt collected towards the right end of the sill.  Was the wind in Greenwich Village (NYC) moving in an easterly direction on February 18-19, 2011?

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