Have a silver tongue? This month's mini-Annals of Improbable Research announces a limerick contest brought to you by lumpers, splitters, and nosology. "To the extent that he pulls together the multiple features of single gene syndromes, the medical geneticist is a lumper. To the extent by various means that he identifies heterogeneity, he is a splitter," writes Victor McKusick in the 1969 paper that is the inspiration for the contest. The mini-AIR lists two rules for the contest: "Please make sure that: (1) your rhymes actually do; and (2) your poem is in classic, trills-off-the-tongue limerick form." If you win, they might send you something. Or not.