This reminds me of a joke about a mathematician and a physicist. The physicist goes to the staff room to get a coffee, and sees the mathematician beaming with joy. "What's the smile for?" asks the physicist. 'I've just perfected a formula that will determine the winner of any horse race using some basic, discoverable data.' "Wow", says the physicist, "shall we go to the race track and test it out? We could be rich by this evening!" 'Ah' says the mathematician, 'at the moment it only works for a spherical racehorse running on a Euclidean plane in a vacuum.'