Friday, March 3, 2017

halacha - Is it forbiden to drive a car?



I remember reading an answer here saying that it was forbidden (even for men) to drive a car. That one Rabbi used to forbid it. I tried to search it but I did not find it. Maybe someone can help.




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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{...