Frog experiment

Professor Dumbarton conducted an experiment at a small California agricultural
college to show how a frog reacts to a human stimulus.

The scientist explained: "At first the frog jumped sixteen feet. When I cut
off one leg, I established that a three-legged frog could only jump twelve feet.

Then I cut off another leg and yelled, 'Jump!' I concluded that a two-legged
frog could only jump nine feet."

"I then discovered that a frog with one leg can jump only six feet. I cut off
the last leg and shouted,

'Jump!' again, but the frog didn't move. I therefore concluded that a frog
with no legs is deaf!"