BillyS - 8:47 pm on Oct 4, 2004 (gmt 0)

Nice theory Billys but why update the smaller index less than the big one?

Updated less frequently to stabilize the results and conserve resources. Common queries should have been answered many times over, no need to rush in with new answers.

It also makes for a better user experience. They type in a common two word query and get virtually the same results a month later. The end user appreciates this because it allows them to find things again. This raises confidence in the results thereby creating loyalty to Google.