Good article on "Does depth matter"

The article is good, but I am not spending $25 for tips I can get on here, so please don't think I am associated with the sale of whatever he is selling.
 
I bought his DVD on Ebay used for 5 bucks or so, maybe less, I dont recall now. It had a few interesting bits, but nothing worth 25 bucks, in my opinion anyway.

The article on density was interesting, but nothing I hadnt already noodled through for myself...
 
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