In @GabeK's nice answer to @JonBannon's question Each mathematician has only a few tricks, there is unexpected space at the beginning of the third paragraph:
My first thought was that there might be a macro definition or something at the beginning of the third paragraph, so I opened up the edit window to see. Not only is there nothing obvious in the source to cause this extra space, but also it goes away when editing:
I see this on both Firefox and Safari, using the HTML-CSS renderer. Why?