I have 20k to invest ...

[buffett]

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Rule Breaker subscription is $199 for the year

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Whoa. I had no idea about this. Sorry.
I didn't know they've since turned this into a newsletter.
If you can search the fool.com archives to read the Rule Breaker (and Foolish 8, if you can find that) archives from the Good Ol' Days ('98-'03, roughly), that should be quite a good start for your "high risk, high reward" education.