Colani postulated racks made of tree trunks, though a definitive answer is still elusive.
Part of the reason we don't have a definitive answer is this.
A definitive answer is impossible because what constitutes rock'n'roll is so open to interpretation.
But a definitive answer is impossible without the black box, which should contain the pilots' final words as well as various flight data.
Indonesia's meteorological agency has said that the bad weather likely caused the Airbus A320-200 to crash but a definitive answer is impossible without the data recorders.
A definitive answer is unlikely under the Bush administration, which has insisted in court that not a single page of 7,000 documents on the program can be made public.
A definitive answer is not likely to be reached until a rabbi can be dispatched to a remote mountain region of Bolivia to inspect certain quinoa operations, said Rabbi Sholem Fishbane, director of the kosher supervision service of the Chicago Rabbinical Council.
Finding a definitive answer is proving rather trickier.
The only trial underway that may provide a definitive answer is an 18,000-patient study Merck began in 2005, comparing Zetia with a placebo.
Coming up with a definitive answer is hard, but "bibliometricist Enrique ofduña-Malea of the Polytechnic University of Valencia in Spain and his colleagues used four different methods to estimate Google Scholar's total number of documents".
The problem with finding a definitive answer is a simple statistical limitation: all of the studies are correlational, so there's a host of variables, like personality or family support, that can't reliably be sorted out.
