I did follow them. Where in my post did I insult you? And, yes, there were 'mistakes' in your post. I actually work in a chemical laboratory and I've visited many other chemical laboratories. It is not 'common' practice to use alcohol burners. I've checked with other chemists in my laboratories and, with the exception of one guy who used one in his garage when he was a kid, no one else has used one. The most common response from anyone under the age of 40 was "What's that?"