Out of mere curiosity, where exactly is this line that separates the 'top 20' from what are not? I mean, if we follow the US news ranking, Emory is #24 and NU is #23 while Upenn, WUSTL, UT and Cornell are #19 but can we affirm that the latter are the better than the former? If we follow the somewhat outdated NRC ranking which is posted on this thread, MIT is #21 while Illinois, Indiana, and TAMU which are out of T20 in US news ranking are in T20. I mean, I understand that Princeton or Yale would be firmly better than the most of the schools except the 'presitigious' few, but where would be the exact line between the 'worthy' school and not?