[Vermont Lt]

And the Arabs went to all that double coming up with the way we write numbers. What a shame not to use them.

And how do they keep track of the heads: if Abdul chops off four heads and gives one to Abdullah, how many heads does he have left?

[Vermont Lt]

Double= trouble. Damn iPhone.

[reg45]

The “Arabic” number system was stolen from the Hindus of India.

[hummingbird]

"....if Abdul chops off four heads and gives one to Abdullah, how many heads does he have left?"

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He still has four - counting his own, that is.

Sounds like the kind of question Turtles like!