3 ms·I pay $40 or less for a quantum mechanic book. Knowledge is not expensive.by ovicorps 6y agoI pay $40 or less for a quantum mechanic book. Knowledge is not expensive.wealthyyy 6y agoI'm not interested in quantum stuff because I have limited time in my life. I'm so classical.ovicorps 6y agoClassical physics books are LESS expensive. I recommend the book: On The Shoulders Of Giants.