Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Read Something New

The human mind thrives on novelty [ For more on 'novelty' go here: http://www.braingle.com/mind/351.html ]. Without new experiences our brains get bored and lazy. One way to introduce novelty into your life is to read something that isn't your normal fare. Pick up a magazine that you have never read, or look through a section of the newspaper that you normally skip. Go to a library and pick a random book from a random shelf.

This is a great way to learn new and interesting things. You never know when you might discover a new interest or learn something that relates to something that you are currently working on.
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For more mind exercises: http://www.braingle.com/mind/