Many east Africans, southern Arabians and Indians share particular mutations of the genes in question which are found in energy-generating structures known as mitochondria.

ECONOMIST: Out of Africa, always something new

There are now 400 Arabians at Janow, alluring and silken to the touch.

ECONOMIST: Horses with wings

On a happier note, Russians and Croatians clearly like to party: They set aside 6% and 5% of their budgets for booze, tobacco and narcotics, more than the rest of the countries on our list, while Saudi Arabians' conservative intake barely registers in the numbers.

FORBES: How The World Spends Its Money