Comment by dang

There's no aspect of this that we haven't publicly explained over and over again. Here's one example: https://news.ycombinator.com/item?id=46378818. Here are countless others: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...

If you read some of those explanations and still have a question that isn't answered there, I'd be happy to take a crack at it. What you shouldn't do is take commenters' claims about it un-skeptically, because sometimes (as in this case) they are false.