Quora! The question and answer site: Here's a great example: Question: Engineering Management: Why are software development task estimations regularly off by a

Quora! The question and answer site: Here's a great example: Question: Engineering Management: Why are software development task estimations regularly off by a factor of 2-3? Answer: http://www.quora.com/Engineering-Management/Why-are-software-development-task-estimations-regularly-off-by-a-factor-of-2-3/answer/Michael-Wolfe http://www.quora.com/Engineering-Management/Why-are-software... Exploring, reading, writing, upvoting, and commenting on great question and answers from all sorts of subjects, has helped me learn a lot. The people there are great too, with many lending expert knowledge you wouldn't see elsewhere.