You're discounting the context. If you read the title as "Numbers Everyone [who reads this site] Should Know" then it makes more sense. If you're complaining a

You're discounting the context. If you read the title as "Numbers Everyone [who reads this site] Should Know" then it makes more sense. If you're complaining about the Hacker News title, then: a) It's the linked article title, so it would be inappropriate to change it, and b) HN shows the domain name of the link in parentheses after the title. The article was pretty much in line with my expectations for a High Scalability article with that title.