OK, I see that, but only because you told me so. That is sooo user-unfriendly! (In my opinion, anyway.)
It's right there in the Member's Profile too... just click the "Options" drop-down near the top left (under the photo). Tabs on top are a quick way to see most recent activity without having to dig deeper.
I think that at the very least, the tab headings should read "Most Recent Posts" and "Most Recent Topics". (On my screen, there appears to be enough room.) Either that or a flashing neon sign that says, "For Topic and Post histories, don't look in the obviously-labeled places. Instead, try the various buttons with names suggesting other purposes. One of them hides links to the topic and post histories."