Update: Stephen Downes quite rightly takes me to task for the strike-throughs in the original essay, preserved here to keep me humble.  I tracked down my error after he got in my face (in comments below).

When I used Wolfram|Alpha to convert pounds of silver to dollars, the website converted the sum of pounds of silver to Pounds Sterling… and I realized I needed to convert 2,320,000 pounds of silver to kilograms.  Then I multiplied 2,320,000 by 2.2 instead of dividing… 5,104,000 kg of silver instead of the right number.  Then I forgot basic metrics, and substituted kilo- for cento- …. Ack.  See this yellow-clear stuff on my nose? See that? That’s egg. On my face.

For the last several days, I’ve been wondering about Arrian’s assertion in his life of Alexander the Great, that at the capture of Persepolis, Alexander and his army captured 40,000 talents of silver.

Now, a talent is a measure from ancient times, about 58 pounds of silver or gold. So I’ve been wondering, how much is that?

I’ve asked a few colleagues, and it turns out that people are curious. Not as curious as I am perhaps, but curious. But it’s been gnawing at my insides for a few days, and I didn’t know how to solve the problem.

Then I realized, I DID know. I used Wolfram|Alpha. So, 40,000 talents of silver is about 2,320,000 pounds. And that amount of silver is 96.4 cubic meters – not quite a cubic kilometer of silver, but close.

And its current street value? Around 2.6 billion dollars. $545 million.

So maybe Arrian is exaggerating. It’s possible. It’s even likely. Maybe it’s not pure silver.

But say that he isn’t?

It kind of explains why the economy of the Middle East took off, once Alexander died and his generals finished settling who got what.  A lot of soldiers had a lot of money in their hands, and were looking to spend.  Money that had been sitting in a royal treasury slipped out into the rest of the economy.  And that paid for things like the Colossus of Rhodes and the Library of Alexandria and the troops that caused such difficulty to the Maccabees and… and…

It paid for Hellenism.

In the current climate of on-again, off-again confrontation with Iran, it’s probably worth keeping in mind that the sack of their ancient capital, and the looting of their empire, helped jump-start the scientific revolution that led to the rise of the West.