Friday, June 22, 2018

product recommendation - What is the best way to keep bugs out of the sukkah?


What is the best way to keep bugs, specifically mosquitoes, out of a sukkah on Yom Tov? I've looked into various candles, tiki torches, etc., but they won't last through both days of Yom Tov.





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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{...