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I have never used Audio files. I won't be able to concentrate to Audio files for long.
It's actually a real book haha. I used to read a lot of e-books but now with work and whatever else, hardcopies are so much more useful as I dont have the means to read e-books anymore. I'm getting an iPad soon so my book reading will hopefully stupidly multiply.
I think Audio Books would be great for going for long walks. I seen a woman walking down the street the other day reading, literally walking and reading. I was impressed she didnt walk into any lampposts! haha