Hacker News Reader

Wow! did not know that this surfaces time and again. I think, we need meta-post which says Posts that HackerNews readers don't really read.

Add the article on Big O notation to that meta-post please!

Maybe it's the influx of new people to the site that upvote these articles?

How do you keep track of previous HN threads about a URL ?

Click the "past" link at the top of the thread. Very useful feature added some months ago.