> How come 10 digits are enough to tag all the cows in the civilized
> world ? That would be far fewer than 10 billion (10^10 - is it base
> 10 ?) cows. I thought they outnumbered humans

AFAICT, cow numbers are far less than humans. eg France has
human pop of 60m, cows are 20m, US has 300m vs 160m. I think
most countries would have cows but some, eg Iceland, will have
bugger all

Besides, you could use non-numeric characters. A-Z, a-z, Smiley
Face, Batman sign. Get you a good 100^10 easy. Handy if you
want to tag fish, rabbits, beetles, ants.........

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