My laptop crashed 10 days back and I had to make do with out one till the new one arrives. After a looooong time, staying completely away from system allowed me some time to think on some aspects which I had not focused on . Managed to read some terrific books on Fourier series in the last 10 days. Fourier series is something that I learnt in undergrad and conveniently forgot it as I never came across a practical application(may be bhag daud ki zindagi mein, never took time to understand i guess), until I came across Vol Modeling.