He called his invention the colour-difference travelling matte scheme.

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Far from causing confusion, the difference in colour has seen Walkers chart an inexorable march to the top of the UK crisp market.

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These so-called quantitative traits are under the control of a number of different genes acting in concert as opposed to qualitative traits such as human eye colour, where a difference in a single gene produces a single, sharp distinction.

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Study of these fragments showed that they sometimes differed from one another in three places along the length of the gene although this did not prove that any or all of those variations caused a difference in coat colour.

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' or mentioned the difference in his skin colour, or questioned his presence in our life.

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Alex (his name supposedly an acronym for Avian Learning Experiment) eventually learned the names of about 50 objects, knew the numerals from one to six, could perform simple addition and used categories such as similarity and difference, shape, colour and material.

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After several hours of this, learning the difference between a four-day-old horse and a cow carcass - the colour, smell, and muscle tone - the kind lady who showed us round, led us to a warm room where we could remove our hair nets and overalls and take comfort in a bowl of vegetable soup.

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The interesting difference between Intel, AMD and ARM, though is not the clash of people that seems to colour the Intel, AMD relationship.

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