KnowledgeToday will be on a holiday break until the first week of January. To tide our readers over, here’s a roundup of this year’s most popular stories.

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Top Ten from 2011

Nassim Taleb on living with Black Swans

Mission Critical: 15 Principles to Help Leaders Meet Their Toughest Challenges

How Sustainable Is Groupon’s Business Model?

Tough Calls: How 40 CEOs Made Their Career-defining Decisions

A Bias against ‘Quirky’? Why Creative People Can Lose Out on Leadership Positions

Should Performance Reviews Be Fired?

Why Middle Managers May Be the Most Important People in Your Company

What’s Behind Microsoft’s $8.5 Billion Takeover of Skype?

Under Armour’s Kevin Plank: Creating ‘the Biggest, Baddest Brand on the Planet’

Gross Domestic Happiness: What Is the Relationship between Money and Well-being?