Sunday, June 3, 2018

halacha - Can one ask a trained animal to do Sabbath work


Is there a prohibition to use a trained animal to do Sabbath work such as turning on a light. (assuming the animal belongs to one's non-Jewish neighbor).




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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{...