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.

BBC: What is anthropological genetics?

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%.

BBC: Vodafone pulls Aussie float

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

CNN: 'Earth' takes viewers on 'breathtaking' global journey