We were fed horror stories about children who had disobeyed the no-swimming rule, only to be hit by intestinal cramps in the water, something which apparently turned you blue in the face and caused you to drown.

BBC: An Italian's view on British winter clothes

Director of the Medical Research Council's clinical sciences centre Chris Higgins said "Once in a blue moon something does not get picked up in animals which is there in man".

BBC: NEWS | Health | Drugs trial rules are tightened

And then, every once in a blue moon, something comes along that is in a category all its own.

FORBES: Live Like a Tycoon in This $78 Million Dollar Mansion

In an effort to find out, the Pew Charitable Trusts asked my Tax Policy Center colleagues Eric Toder, Jim Nunns and Joe Rosenberg to set up something of a cage match: In the blue trunks, a broad-based VAT (think 9-9-9 only much less complicated).

FORBES: Deficit-Fix Cage Match: VAT Vs. Higher Income Tax Rates

When the NABP investigators ordered Zyprexa, Lilly's top-selling antipsychotic, they got something called Telorzan, packaged in a cheap-looking blue box.

FORBES: Bad Medicine

Not quite as long as Saxe has in developing something called SmartGlass, which changes from dark blue to almost clear with the turn of a knob.

FORBES: Magazine Article

He had penetrating sky blue eyes that seemed to look right through you, as if in search for something he desperately needed.

NPR: 'Arson' by Nick Lysohir

What we're seeing now -- Anthem Blue Cross and others -- is something on an exponential magnitude of what we had seen in the past, even in that increase.

WHITEHOUSE: Press Briefing