QUESTION: What's the best free website to find experts in a field?

question / pregunta: 

I know there are a lot of website that connect journalists with experts, and a lot of them don't tell you that you have to pay until after you register. What's the best website that, for free, will hook a journalist up with an expert in a certain field?

QUESTION: alternative encyclopedias

question / pregunta: 

Can you suggest some alternative encyclopedias, of any subject, which would be good general sources?

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