<p>I’m puzzled by the objections to “Sometimes” that I wrote. I agree in principle with G.P.'s comments, but is it guaranteed always the case? Of course not. Note that at the LACs, the undergrads do it all, and is one of the reasons that LACs that require a senior research thesis generally have a higher percentage of future PhD earners; they have already shown the PhD schools that they know how to do the necessary research.</p>