" fleas from a boat before it, the celebrated experimentalist Van Dulmoholtz takes a carefully tears off his hind legs and gently commands him to jump aloud. Note that the flea does not move and makes to try another. When the fleas are gone from the boat, makes its statistical and satisfied concludes that fleas have heard in the hind legs " (John Allen Paulos," The man aNumber "Tusquets, Metatemas 20, Barcelona, 1990, pg. 111)
Obviously the "experimentalist famous" does not exist and this is a joke, but he uses very well the author to explain failures in reasoning " Refuting the assertion that something exists is often very difficult. And it often makes this difficult to prove that the statement is true " (ibid. 112).
fallacies An example of the sort that might be in finding the existence of gnomes and other fantastic beings on the grounds that can not prove that there are no .
knew the joke of the principle in another version: An experimenter, very sure that the facts "speak for themselves ", took a roach, put it on one end of the table and from the opposite began to call softly "Come cockroach, come, come ..." and indeed the creature moved toward him. Our investigator noted neatly scrolling speed. Then I took a leg, placed it in the same place and call again. The cockroach came, but clearly, more slowly. Re-register the new data. And he did until he started the six (experiment obviously took a lot because the poor insect with two, and I say to one, zigzagged like a drunk). Once without his legs, returned to call ... despite their claims the poor animal did not move there. So our research also showed the new fact.
With all the data in hand, and then think carefully about them, reached the following conclusion (which considered unassailable): The speed of an insect is directly proportional to the number of legs. And when they disappear, it becomes deaf.
already know, then, that the facts speak for themselves :-)
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