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This simple policy change enables what's been called the 80/20 principle, a theory practiced by Google that employees who spend 20 percent of their time on company-related projects that interest them will work better.

The fundamental shift that Sir Ken is talking about is more similar to discovery based education. Just like google which allows its employees to use 20% of their time to pursue any pet project, I think the education system should have 20% time free time for kids to to pursue any idea or vision or dream maybe within school or outside the school. This is one way to balance the rigid structure of the current learning against total flexible system where its easy for kids to be lost without learning some valuable knowledge. So the main question is should we allow 20-25% of time as free time to pursue their dream ? I think it is yes

20 Top Tweeters for Maths Teachers

This list of top tweeters is specifically designed with maths teachers in mind

a simple set of rules to presentations: exactly 20 slides displayed for 20 seconds each. That's it. Say what you need to say in six minutes and 40 seconds of exquisitely matched words and images and then sit the hell down.