I am studying machine learning which requires some math so I went to dig out my old math textbooks from the storage. (It had been almost 20 years since the last time I set my eyes on them.) I went to amazon to check if there's kindle edition available. To my surprise, I found the price of one of the textbooks I bought 20 years ago had almost tripled. Even used one cost twice the original price. It's almost like the price of gold. Wow, I know knowledge is invaluable, but who would think your old math textbook can be gold.
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