Can one wear non-prescription sunglasses on shabbas in a place where there is no eruv? Do we say since if the sun gets blocked one might come to take them off in a karm'lis, or do we say it's like regular glasses?
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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