Sunday, July 22, 2018

halacha - How does a person who has left Judaism return?


What is the process for a person who has left Judaism and converted to a different religion, who now wishes to return to Judaism? I have heard (based on an Avos D'Rav Nosson) that he would need a second circumcision and Mikva. Is this true?




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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{...