re: What percent Native American are you? Which tribe?

I can't answer most of that. I did the test mainly for entertainment but also because my father was adopted.

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How exactly do they determine the control or source populations they've tested from these places to say, ok you're British, or French, or German. I'm not even sure what British is ethnically speaking...the original Celtic inhabitants?

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I believe they mostly use samples from different areas to isolate genes. In other words, there isn't an Irish gene, but they look for matching markers from those places that show genetic patterns specific to geographic areas.

Or not. I'm not really sure.