Hand edited search results?

I just wanted to know why does the Google.com domain and the adsense pages have descriptions in the google search engine that are not present in a meta tag or even on page?

Do a search for Google and then do a search for adsense then look at the descriptions in the search results, where are these descriptions being pulled from, and is it hand edited?

Google
Enables users to search the Web, Usenet, and images. Features include PageRank, caching and translation of results, and an option to find similar pages.


Google AdSense
Offers a contextual advertising solution to web publishers Delivers text-based Google AdWords ads that are relevant to site content pages.

 

Those are DMOZ descriptions.

 

Wow ok I never even knew that google was using dmoz descriptions, quite interesting.

Thanks

 

I think they've been doing that for about a year or so.