They said it was an "unexpectedly dynamic" process, with chemicals in venom being formed through evolution and then later being adopted by parts of the body for other uses.

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This dynamic can be seen not just in economic life but in the evolution of all things, from cuisine, urbanization and legal systems to our own existence as a species on this planet.

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As he describes the Clinton team's evolution from relative impotence in Bosnia during its early months to dynamic involvement in 1995, Mr Halberstam gives a sympathetic hearing to the foreign-service officers who protested strongly because America seemed to be condoning Serb atrocities, about which the United States, with its signal and satellite intelligence, was uniquely well informed.

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Over the course of their evolution, social game makers have also tended to try and broaden that dynamic with different themes or surface differences in gameplay.

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