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I wonder how to create interactive guiding pages on a website? Such as http://www.learnstreet.com/lessons/study/javascript. Thanks a lot! T

Amazon uses Data warehouse for E-commerce. What's the role of Data warehousing to help Amazon to implement its strategies to achieve a competitive advantage? Such as price strategy…

What Amazon's strategies are related to the data warehouse and how data warehouse help the strategies to achieve competitive advantages?

"Alarm clocks are bad for learning!", but is there any good ways to avoid the alarm clocks? I even feel uncomfortable without the alarms.