The Iraqis say that they produced just ten litres of concentrated ricin before giving up when tests of its dispersal were unsatisfactory.

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It is among the first hit products in a wave of hundreds of new DNA diagnostic tests that will overrun medicine in the next five to ten years.

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Among ten-year-old black children 41% fail their basic reading tests, and so do 38% of the Latino pupils.

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After ten weeks of Tai Chi classes, the study group showed significant improvements in tests of their memory, language, attention, stress, mood and fatigue.

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But Arnott's statistical tests indicated that the natural tendency of good earnings to follow bad was a far less powerful predictor of ten-year earnings growth than the payout ratio itself.

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