Query to all:  Can anyone describe what happens to individual bees in
cool/cold temps.  The bees cluster at 57 degrees, but they obviously fly
at lower temps.  Also the inside of the hive must be much warmer than
outside at that temp range.  As the temp goes down, do bees have less
flying time.  Are they "warmed by the cluster" and are they then able to
fly for a short distance for cleansing flights etc.  At what temp does
their flying activity fail to keep them warm enough so they don't make
it back to the hive?  Gert Walter