Alex has one, and as I recall he found it very useful. He has particularly mentioned how great it is to, say, hear about a book via some interview on NPR while driving, and by the time he's reached his destination, he's purchased it and is ready to read it.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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