One of the 39 Melachot
This includes all activities where food
is separated from its inedible
means of the wind
The prime example is winnowing grain, where
it is thrown up in the air, allowing the chaff
to blow away.
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Most of this information is taken
from the book "SABBATH Day of Eternity"
by Rabbi Aryeh Kaplan, published by NCSY.
In the book itself, there are notes that refer the
reader to detailed footnotes.
I am lucky to have found such a clear, concise manual
with these brief overviews of laws so vast and complex
there are Rabbis that specialize in them.