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“Arrogance is ignorance plus conviction,” blogger Tim Urban explains. “While humility is a permeable filter that absorbs life experience and converts it into knowledge and wisdom, arrogance is a rubber shield that life experience simply bounces off of.”

Lakhani and Wolf uncovered a range of motives, but they found that enjoyment-based intrinsic motivation, namely how creative a person feels when working on the project, is the strongest and most pervasive driver.

• Intermediate scenario: A moderate market contraction of between 22% and 25%, or $68 to $77 billion.

We often see turnover in content brands that’s caused when new brands discover something important that younger audiences want, but is incompatible with the values of the incumbent brand. The incumbents can’t copy the startups’ content, or they’d make the product worse for their existing customers.

“We built a heck of a product,” Springpad cofounder Jeff Janer says. “But we didn’t build the business."

6. If you were able to live to the age of 90 and retain either the mind or body of a 30-year-old for the last 60 years of your life, which would you want?