In grad school, we had two weeks for a take home exam with just 4 questions. I got a 62. High grade was a 68. It was absolutely brutal, going to the library to look things up didn't help much, and talking to my classmates was a crap shoot at best - none of us were sure of anything. The problems literally took *days* to answer (if that's what you can call it). My answers ended up taking about 40 pages to write, not counting the plots, tables of results, and listings of the programs I wrote to do the numerical computations.

The class was theoretical nuclear physics and the four questions were open/unsolved research problems - the prof wanted us to take our best shot at solving them. The one question I remember was to work out the identities, isotopes, amounts and sequences of synthesis of elements in stars of various masses. Ouch. The prof wrote on my 'solution': "with this answer, you have successfully undone 500 years of progress in algebra". Ouch again. As far as I know, this problem is still unsolved and likely to remain so for a looonnngg time. Nobody actually *solved* any of the questions, we just spewed a semi-random pile of drastic approximation, unjustified assumptions, unsupportable simplification, incoherent derivation, and unadulterated mathematical bloviation.

Give me an in-class, closed book exam please.