Saturday, August 25, 2018

halacha - Is live video a halachic substitute for physical presence?


If you are in a room with cameras in it, is it like the people looking through those cameras are in the room?




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

Apparently the of last four, MgX2+ is closest in radius to LiX+. Is this true, and if so, why would a whole larger shell ($\ce{...