It's meant to say "chill out man". Far too often someone on HN says something that's just common knowledge or off-the-cuff and someone else responds with "where's your evidence and peer reviewed study?". It's nonsense. Actually it's worse than that, it's rude.

I'm not arguing for or against anyone's specific claims, just telling you that you don't need a scientific study to say that as people get older, their bodies tend to hurt more and areas they've injured but never let heal hurt more than other parts. I don't think rb808 was necessarily arguing that either, just pointing out that bodily damage isn't always immediately noticeable. But you apparently need scientific proof of that?

Some days I think if I said "the sun rose over the horizon this morning" I'd get a follow-up saying "show me your sources or delete your comment". Science isn't a cult or a religion. If you need a peer reviewed study to tell you that improperly healed injuries will hurt more as you get older, you should talk to the elderly more often.