If the new pension regime has an Achilles heel, it is the state-owned institutions still associated with it.

ECONOMIST: Economic and social reforms remain incomplete

But the revolution in military robotics does have an Achilles heel, notes Emmanuel Goffi of the French air-force academy in Salon-de-Provence.

ECONOMIST: Robots go to war

Meanwhile, what was once an Achilles heel is becoming a competitive advantage.

ECONOMIST: America��s economy is once again reinventing itself

This requirement, though reasonable and common, could be an Achilles heel.

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Imagine having banks in Cyprus become an Achilles heel for Europe.

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Now they think they have found an Achilles heel: global warming.

ECONOMIST: Oil and the environment

But while the simple requirement of a physical DVD is an impediment to casual downloaders of illegal content, that physical format has also left consoles with an Achilles heel that has been getting a lot of attention in the press these days: used games.

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If Huckabee has an Achilles' heel, it's his lack of experience, Holland said.

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Until now, index funds have had an Achilles' heel.

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That makes the antibodies useful weapons in attacking the virus' Achilles heel, and a potentially powerful target for an effective vaccine.

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Peters, on the other hand, will be spending some of his new free time suing the makers of Roll-A-Bout, an item he blames for the re-injury of his Achilles heel.

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