Wilhelm
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 Sep10 awarded Good Question Nov12 awarded Yearling Aug3 awarded Popular Question Jul20 awarded Nice Question Dec11 awarded Quorum Dec9 awarded Precognitive Jul28 awarded Teacher Jul27 awarded Beta Jul23 comment Why $\sqrt{-1 \times {-1}} \neq \sqrt{-1}^2$? Only problem I see with these, is that when one is shaky on the laws simplifying might be a problem. Jul22 awarded Student Jul22 awarded Scholar Jul22 accepted Why $\sqrt{-1 \times {-1}} \neq \sqrt{-1}^2$? Jul22 comment Why $\sqrt{-1 \times {-1}} \neq \sqrt{-1}^2$? Well sqrt(-25) / sqrt(-1) = 5, so the explanation doesn't seem quite complete. Jul22 asked Why $\sqrt{-1 \times {-1}} \neq \sqrt{-1}^2$? Jul22 comment What can we conclude from correlation? Not really what you wrote. You wrote that "people become right handed as they grow older" which either means age -> right-handedness or age <-> right-handedness. But if there is another factor that influences both, those statements may be false. With the question as stated nothing can be concluded, more information is needed. Or do you believe in en.wikipedia.org/wiki/Paul_the_octopus ? Jul22 answered What can we conclude from correlation? Jul22 answered Are the “proofs by contradiction” weaker than other proofs? Jul22 awarded Supporter