Many of L'viv (then Lwów) professors (for example Stefan Banach, of the Banach-Tarski paradox fame) survived only because they were hired as "lice feeders" in the http://en.wikipedia.org/wiki/Rudolf_Weigl institute, and he managed to persuade Germans that they need consistent data, so they can't take his feeders away just because they are Jewish or Polish.

http://en.wikipedia.org/wiki/Feeder_of_lice#Lw.C3.B3w_academ...