Why, can't we remember everything?

Yesterday Manas and I got down to discussing some DSP. And I realised that I
had forgotten almost everything! The difference between DFT and DTFT,
spectrum leakage, periodicity of the DFT and its causes. I had everything at
the tip of my fingures a year ago ... and now it's all gone. I am left with
vague memories of all these concepts. The underlying reasoning and logic just
completely eludes me as of now. And it's just so damn frustrating.
Urggghhhhhhhhhh ....

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