Just has to be ! :) Those whatever for dummies books never really appealed to me. No matter what the topic. They are nice, however, if you want a good overview but they don't contain any information that can't be found on the Internet for free - being so general. But for more advanced stuff you'll find it hard to find any decent articles on the Internet.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.