Joseph and His Brother

I grew up In Russia and was raised on the metric system based on the decimal arithmetic. When we immigrated to the U.S., I had to learn a new to me (but, actually, very old) Imperial system of measurements having 12 inches in a foot or 12 ounces in a pound. I still struggle with it (decimal system, apparently, was hardwired in my brain). There are many number systems or positional notation systems. Ancient Babylonians used base-60, Hindu-Arabic system uses familiar decimal base-10 system, Mayans used base-20 system.  There is base-2 binary, base-12 duodecimal and base-16 hexadecimal systems to name a few. Aside from the binary system used by computers, we humans use mostly decimal and, some times, duodecimal systems. The all-familiar decimal system is used in metric system of measurements. In base-10 [...]