Wednesday, May 10, 2017

minhag - Why are the ends of Tefilin Retzuos cut on a slant?


I noticed than the end of my Tefillin Retzuos are cut on a slant. In the comments to this answer various reasons are postulated. What is the true reason?





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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{...