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i like this discussion, keep it up we need more like this, BTW, I think the best approach is keep the theory as the corridor to discover a new things try something new is good but there is a limitation based on theory, so let discuss how far that limit carry on

LOL. Here goes one example of "theoretical stuffs". Why don't try to build a satellite instrument to see earth surface freflectance in ultraviolet o shoter wavelegnghs? Answer: it''s IMPOSSIBLE to see that from space due atmospheric absortion!!! What you call "theoretical stuffs" is the cause that we need the soft. "Discover" dosen't mean "ignore" knowledge. Belive me, maybe the soft allow you to get some result. But these result is a useless. I hope your doctor don't sahre your point o view!