The lower case t in question titles and other places where the font is larger than body seems to be poorly formed. It's a bit too short, typically the same height as the top of the curve of the lower case e rather than being a touch above it.
Here is what it looks like to caseyr547:
Apparently this isn't universal as Caleb (Linux/Xorg/Chrome) doesn't have the same issue. At risk of being recursive here is how his browser renders, which the other screen shot showing for reference: