Some do, many, including me, don't. As you might expect, those that do really believe in them.
If you have any sense that one may be helpful for you, give it a shot and decide for yourself.
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Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.