When we rewire our brain, it does not mean that the initial wiring dies away. While it has definitely grown weaker, it is still out there somewhere.
The best way to get the brain to do its job in the way it has been designed to do, is to avoid information overload and upload helpful stuff into our brain.
When we can change the way we think, we can also change the way we feel, and the way we act through our feelings. This is how we can master the mind.
The best IQ test is the one that we create and fill out for ourselves through introspection and understanding of our own personality.
The problem with multiple interests is that it moves us away from the more important things that we should be doing and want to become great at doing.
We can train the mind to overcome distractions, even if the task on hand is not interesting. It begins with changing the direction of our thoughts.