To compare alien planets, Dr. Mendez at the Planetary Habitability Laboratory and his colleagues are creating an Earth Similarity Index that ranks worlds by their resemblance to our own planet, on a scale from zero to one, based on their mass, radius, density and surface temperature.

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The country has long been used as the example of where not to be on the Gini co-efficient a scale for income inequality where one means one person has all the country's income and zero means everybody has an equal share.

ECONOMIST: Brazil