> which weighs the same no matter how many books are on it Fun fact: a fully loaded kindle weighs more than an empty kindle, by about 10^-18 grams. So, at a ma

> which weighs the same no matter how many books are on it Fun fact: a fully loaded kindle weighs more than an empty kindle, by about 10^-18 grams. So, at a maximum of 50mb per book, each book would come in below 12.5 zeptograms (normally below 0.25 zeptograms). http://www.nytimes.com/2011/10/25/science/25qna.html http://www.nytimes.com/2011/10/25/science/25qna.html