 In an 18 August 2006 Science Friday interview, Mike Brown expressed doubt that a scientific definition was even necessary.He stated, "The analogy that I always like to use is the word "continent".You know, the word "continent" has no scientific definition ... they're just cultural definitions, and I think the geologists are wise to leave that one alone and not try to redefine things so that the word "continent" has a big, strict definition."