Goal-based Endorphin Release

When I told Melissa about 43 Things, the goal-based social networking service, she told me she'd read that endorphins are released simply by checking off a task on a to-do list.  I did a little research (well, googling), and uncovered an inspiring article on setting and achieving goals:

As you accomplish an important task, you will feel a surge of energy and enthu-siasm.

Completing the task will trigger the release of endorphins in your brain, causing you to experience a natural high.

You will actually become addicted to this feeling as you continue to complete challenging and important tasks. So, as you put in more effort, it will generate its own momentum.

Now I still haven't found any references to this phenomenon in any medical journals, but I think I'll do a little experimenting with achieving a natural high ... and hope that I do become addicted to accomplishing goals.