Homeland

Chapter 9

This chapter is dedicated to the incomparable Mysterious Galaxy in San Diego, California, and Redondo Beach, CC. The Mysterious Galaxy folks have had me in to sign books every time I've been in San Diego for a conference or to teach (the Clarion Writers' Workshop is based at UC San Diego in nearby La Jolla, CA), and when I've stopped in LA on tour. Every time I show up, they pack the house. This is a store with a loyal following of die-hard fans who know that they'll always be able to get great recommendations and great ideas at the store. In summer 2007, I took my writing class from Clarion down to the store for the midnight launch of the final Harry Potter book and I've never seen such a rollicking, awesomely fun party at a store.  

Mysterious Galaxy
7051 Clairemont Mesa Blvd., Suite #302 San Diego, CA, USA 92111 +1 858 268 4747
2810 Artesia Blvd., Redondo Beach, CA 90278 +1 310 542 6000

-------------------------------

If you ever want to blow your own mind, sit down and think hard about what "randomness" means.

I mean, take pi, the ratio of a circle's circumference to its diameter. Everyone who's passed sixth-grade math knows that pi is an "irrational" number. It has no end, and it never repeats (as far as we know):

3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273 724587006606315588174881520920962829254091715364367892590360011330530548820466521384146951941511609...

And so on. With a short computer program, you can compute pi all day long. Hell, you can compute it to the heat-death of the universe.

You can grab any thousand digits of pi and about a hundred of them will be 1s, a hundred will be 2s, and so on. But there's no pattern within those digits. pick any digit of pi -- digit 2,670, which happens to be 0. The next digit happens to be 4, then 7, then 7, then two 5s. If you were rolling a ten-sided dice and you got these outcomes, you'd call it random. But if you know that 047755 are the values for the 2,670th - 2,675th digits of pi, then you'd know that the next "dice roll" would be 5 (again!). Then 1. Then 3. Then 2.

This isn't "random." It's predictable. You may not know exactly what "random" means (I certainly don't!), but whatever "random" means, it doesn't mean "predictable," right?

So it would be crazy to call pi a "random number," even though it has a bunch of random-like characteristics.

So what about some other number? What if you asked your computer to use some kind of pseudorandom algorithm to spit up some grotendous number like this: 2718281828459045235360287471352662497757. Is that random?

Well, not really. That also happens to be a number called "e," which is sometimes called "Napier's constant." Never mind what "e" means, it's complicated. The point is that e is a number like Pi. Every digit in it can be predicted.

How about if your random-number generator gave you this number: