I just received three upvotes for a seven-year-old answer. Obviously somebody has recently linked to it in a question or answer. Is there any way for me to find this link? I'm curious!
In the sidebar on the right there is a colon 'related' and also a colon 'linked' if there are posts that link to the current one.
There I found If $f(x) \geq 0$, then $g(x) =f(x)+f'(x)+f''(x)+...+f^r(x) \geq 0$ which is very recent.
Of course this only works if the post is linked on this site. Otherwise searching for the ID-number of the post, or rather that of the associated question in case of an answer, can be a way to find links.