Interesting to see that most of the claims made by our troll turn out to be based on incomplete and selective quotation. I'd just like to add that it doesn't pay to confuse an observation e.g. a report of an explosion-like noise, with an interpretation, e.g., that the noise was a bomb going off.

The human ear can be a valuable diagnostic instrument- after all, doctors don't use stethoscopes just for the fun of goosing patients with the cold end- but to serve as such an instrument it requires training.

If you were to play me the sound of a heart murmur as heard through a stethoscope I wouldn't have anything more intelligent to say than "what a crummy drum sound", but an experienced physician hearing the same thing would recognize it for what it was and refer you to a cardiologist.

OTOH, when I'm called into a control room by some overpaid knob-twister who's complaining of a "ground hum", I can listen to the offending noise for a few seconds and predict, with a a great deal of confidence, whether I need to:

look for a ground loop
look for an open-circuited ground connection
look for a faulty power supply producing excessive ripple
go shut off the air conditioning in the live room

The odds are that the doctor who diagnosed the heart murmur couldn't do that.

The difference is training. The doctor has learned how to interpret the sounds heard through the stethoscope as they relate to what's going on in your chest; I've learned to interpret the sounds heard in the monitor speakers as they relate to what's going on in the electronics.

Anyone can make an observation. "A loud bang", "a funny swishing sound" and "a deep smooth 'hmmm' with no treble to it" are all observations, and as long as we remember that they're raw data and not conclusions we're okay. It's when we want to interpret them that the question of knowledge and experience becomes critical.

To interpret those three observations as "bomb", "heart murmur" and "ground loop" imputes a degree of expertise to the person making the interpretation. If that person doesn't actually have the relevant knowledge and experience, it's a mistake to take their interpretation as proved.

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