Roger Ebert explains evolution

My friend Janet sent this movie review to me. It's all good, but I especially enjoyed this part:

. . . as every gambler knows, sometimes you do actually hit a number. You don't have to do it a trillion trillion trillion times to be a winner. You only have to do it once. This is explained by Darwin. If you are playing at a table with other gamblers and you win $100 and none of them do, you are just that much better able to outlast them as competitors. When the casino closes, one person at that table must have won more than any of the others. That's why casinos never close. Of course if you gamble long enough, you will eventually lose back more than the others. Your poor spouse tells you this. You know it is true.

But tonight you feel lucky. If you leave the table still holding your pot, you could become as rich as Warren Buffett. Somebody has to. Look at Warren Buffett. Evolution involves holding onto your winnings and investing them wisely. You don't even have to know to how to hold onto your winnings. Evolution does it for you; it is the bank in which useful genetic mutations deposit themselves. There is a very slow rate of return, but it's compounded. At the end of one eon, you get your bank statement and find your pittance has grown into an orangutan. At the end of the next eon, it has grown into Charles Darwin. Scientists, at least 99.875 percent of them, believe that in the long run only useful mutations deposit in this bank. Those mutations with no use, or a negative effect, squander their savings in a long-running bunko game, and die forgotten in the gutter.