Thanks, Jud and Ed. Jud wrote: << Impossible, as stated. The limit a semi can carry is on the order of 30,000-50,000 pounds. Over 7 million truckloads?

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That's how I convinced myself, too -- est. 8.5 million truckfuls. (As I wrote in an e-mail to the Times, before deciding to ask math-fun in case I was missing something.) --Dan