Better health costs your insurer money and that spending on you is a hidden form of income.

FORBES: Removing "Dismal" From Dismal Median Household Income Statistics

The competition authorities are taking a hard look at Vivendi's new tax treatment to determine whether it is a hidden form of illegal state aid.

ECONOMIST: French business

That means, Grossman says, that if a user can be tricked into typing just a single letter and tab, all of his or her details can be stolen by a hidden form on the site.

FORBES: Apple Leaves Another 'Autocomplete' Privacy Bug In Safari Unfixed

But the life-form has a hidden weakness, and only two junior-college science teachers (David Duchovny and Orlando Jones) can stop it.

NEWYORKER: Evolution

But it turns out that, behind the scenes, Sony may also be installing invisible services in the form of a hidden directory containing cloaked files, which run when you use that media player.

ENGADGET: Sony DRM hacks your PC

Mario, now a plumber, and joined by a lanky brother named Luigi, bounced through the Mushroom Kingdom, dodging or bopping enemies in the form of turtles, beetles, and squid, while seeking out magic mushrooms, coins, and hidden stars.

NEWYORKER: Master of Play