Jarrett Lilien and Nicholas Utton, its marketing head, roll their eyes when Caplan brings up the topic.

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The first head to roll was female.

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Classical music is head music - rock and roll is physical, says Eno.

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Like a couple ready to pounce on the next two vacated seats at the bar, we gave meaningful looks to one salesperson who was feigning that almost-ready-to-rock and roll look as he head nodded with his patrons.

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Whereas traditional product development would involve making product decisions using business intuition and knowledge, Zynga turned decision-making on its head by hypothesis-driven product testing, quick analysis and agile roll-out based on how customers behaved.

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When asked last year about the rules of engagement for tear gas, he told the BBC that police in America are trained not to fire head-high and to either arc the canister into the air or roll it on the ground.

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During the roll call on the House floor, Cantor grimaced and shook his head when his name was called out as a replacement for Boehner.

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Keep your feet flat on the floor, roll your shoulders back and keep your ears directly over them so your head isn't tilted forward.

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Reading between the lines, it appears the Fed, while keeping its monetary policy very accommodative, is beginning to lay the ground work ever so slowly that its money-printing presses cannot roll on forever, especially as the U.S. economy is picking up a slight head of steam.

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