The Zeigarnik Effect

In psychology, the Zeigarnik Effect describes the tendency people have to remember tasks that are partially done better than tasks they have completed, and the desire people have to complete a task once it has initiated.  Discovered by Russian psychologist Bluma Zeigarnk, the Zeigarnik Effect, as well as subsequent studies by other researchers, has led psychologists to the conclusion that the best way to overcome procrastination is to start doing something, anything, no matter how small, which will force your brain to want to keep going with whatever it is you are trying to do.  This also explains why Sudoku puzzles are so damn addictive.

- Genevieve Hayes in the Actuaries magazine

I can certain attest the part about overcoming procrastination.
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