The habitable zone is the region of a planetary system which is neither too hot nor too cold - such that water on the surface of a planet will neither evaporate nor freeze, but instead can stay liquid.

BBC: NEWS | Science/Nature | Earth-like planets may be common

Mr Obama has to make sure that his rhetorical porridge is neither too hot or too cold.

BBC: Obama's do-or-die debate

It is already apparent that the end of the Cold War was neither the end of history nor the end of danger.

CENTERFORSECURITYPOLICY: Letter to the President

But for the moment, Asians and Latinos are enjoying fertility that is neither too hot, nor too cold.

ECONOMIST: Lower fertility is changing the world for the better

Neither pizza nor chinese is delivered cold, and logistically speaking, pizza is larger and requires more effort to keep the heat retained.

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Until this summer, their favourite was Goldilocks: the American economy, they claimed, was neither too hot, nor too cold, but just right.

ECONOMIST: Once upon a time on Wall Street | The