Just plain old awesomeness from Google...
And, while they're doing that, and Google just works for most people there are a small group of users who'd really appreciate better documentation for searching. Wanna-be power users need to know how to combine terms or have options or how to use stemming etc. I dunno why a single page of instructions with examples is so hard to get.
Advanced search (bottom of search results)->Advanced search tips (top of the advanced search page)