The experimenter dealing with nature faces an outside and often hard world. Natures' curriculum cannot be changed. - Martin Lewis Perl

For every good idea, expect to have five, ten, twenty wrong or useless ideas. You cannot avoid the bad ideas if you keep your imagination free. There is no spam filter for bad ideas.

Imagination and obsession are the keys to getting a good idea. To help your imagination keep your eyes and ears open. Avoid the "not invented here prejudice".

You may turn a bad idea into a good idea — don't kill the bad idea prematurely. A bad idea can evolve into a good idea.