For Future Reference (2)

A straightforward explanation of the grammatical distinction between “which” and “that”.

Probably not necessary to note this here, seeing as it was the first Google hit for “which that distinction”, but I liked that the page happened to be aimed specifically at scientists. I also like the general tone of the pages, and the MS-DOS-style 8.3 filenames (e.g., yqal2rit.htm) are kind of touching.