Mathematicians have solved a number mystery that has been puzzling them for hundreds of years.

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This modest paradox has been puzzling me since Mr Miliband's speech to his party conference.

BBC: Has Miliband got his nations in a twist?

This case has been puzzling from the start.

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Skategate apart, Kim Dong-Sung's disqualification in the short track has been the worst of some puzzling decisions.

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It is puzzling that so much has been left out of the HD remix.

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Finally, Pollack's disparaging assertion that "industry ... has been peddling the same two advantages--herbicide tolerance and insect resistance--for 10 years, " is puzzling.

FORBES: The Rationalist

The term has been around in computer science for decades, says Eric Schmidt, Google's chief executive, so it is puzzling that Mr Zuckerberg should get any special credit for using it.

ECONOMIST: Internet companies: Social graph-iti | The