Apparently, there is a unit of measurement, proposed humorously, called the Sagan. It is the smallest unit that can be "billions and billions" - 4 billion or 2 billions plus 2 billions. But there is a new Sagan unit. now proposed, which I think merits some attention, as he didn't actually say "billions and billions". He did say "billions upon billions", which mathematically, is a whole different kettle of stars.

http://blog.circuitmonkey.com/2009/12/25/yet-another-sagan-unit-measurement/

One attoSagan person,
Alicia

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