Still, compared with the other elements of his case, Mr Powell's proof was slim.

ECONOMIST: The weakest part of the case for war

For the comparatively simple case of the Liar, these methods all agree with Dr Zadeh's proof that the sentence is exactly half-true.

ECONOMIST: Fuzzy logic

Is there an Android alternative that's as useful in our special circumstances, and is it compatible with a sturdy, water-proof case for it?

ENGADGET: Ask Engadget: best tablet, software and case for a child with a developmental disorder?