Tuesday, May 1, 2018

history - Matrilineal Descent


I have heard that matrilineal descent (i.e. having Judaism passed down through the mother) comes from the Roman period when women were raped by Roman soldiers and the babies were then said to be Jewish because they knew for certain who the mother was, but they did not know if the father was Jewish. Is there any truth to this claim?




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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{...