I really liked these Google Co-up specialized searches -
One is for world information (look up "libraries" for library information from around the world):
The other is for "green" issues; it can be browsed as well as searched:
http://www.greenmaven.com/
I found that the Google customized search engine was more suited to my style than the Rollyo because it seemed more suited for exploration rather than for inventing something from scratch. Though if I do find the need sometime to limit searches to only a few sites, I will now know how to do it with Rollyo.
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