A prominent Russian scientist conducted a very important experiment. He trained a flea to jump on giving her a verbal command (“Jump!”)
In the first stage of the experiment, he removed the flea’s leg, told her to jump, and the flea jumped. So he wrote in his scientific notebook: “Upon removing one leg, all flea organs function properly.”
So, he removed the second leg, asked the flea to jump, she obeyed, so he wrote again: “Upon removing the second leg, all flea organs function properly.”
Thereafter he removed all the legs but one, the flea jumped when ordered, so he wrote again: “Upon removing the next couple legs, all flea organs function properly.”
Then he removed the last leg, told the flea to jump, and nothing happened.
He did not want to take a chance, so he repeated the command to jump, several times, and the legless flea never jumped. So he wrote his conclusion:
“Upon removing the last leg, the flea loses sense of hearing.”