Hanging signs saying the above was not enough to make people in my synagogue put back the s'farim they have used into the bookcases.
What other mitzvos could I bring on my next edition of the signs?
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{...
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