Wednesday, August 1, 2018

minhag - Why do we cover the challot on Shabbos?


The answer I learned growing up was that "we don't want to embarrass the bread because we are first making kiddush" or some variation thereof. I later learned that is a zecher for the ma'n which fell with a coating on top and bottom. Where does that first answer come from? And, if it is a legitimate source, what does it really mean (ie bread doesn't have feelings!)?




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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{...