Data collection, of course, has to comply with specific constraints that guarantee the causal interpretability of that data.

I would just like to comment on the present epidemic of geekishness which is pervading the ranks of freshmen here at the college. I should correct myself and say that this rare disease seems to have been an integral aspect of the class of '81 ever since it set foot in this once geek-free environment.

I sat down within three feet of the entrance door, and I had no sooner got disposed than the door opened and a man came in […] .

Segmental sections 5 μm thick were prepared and stained with hematoxylin and eosin, and Masson’s trichrome and analyzed by the senior pathologist using a light microscope (Olympus BX-50, Olympus, Japan).