Surprisingly, only 5-10% of the genetic variation present in the human species (that is, 5-10% of the 0.1% of the genome which does vary from person to person) distinguishes one "racial" group from another.

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Mr Aisbitt noted that Australia's All Ordinaries Index has varied by 14.6% in the last 30 days, from an average 30-day variation during the last year of 15.5%.

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Without the earth's 23.5-degree tilt to the sun there would be no seasons, no variation in daylight and darkness, said Fothergill.

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The difference was equivalent to the average variation in cognitive scores between children born at a normal gestational weight and those weighing less than 3.5 pounds, the researchers said.

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