Sunday, July 9, 2017

halacha theory - Is hair part of the human body or not?


Inspired by this answer, I'm curious. We hold that hair of a married woman is 'Ervah (ערוה). Yet it is not 'Ervah for an unmarried woman. According to the Gemara in Shabbath (Bab. 95a), braiding the hair is "building".



Now, ממה נפשך -- if it is part of the human body, why is braiding it "building"?


If it is not part of the human body, how can it be 'Ervah?




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...