Sardar santa research on roach

Sardar Singh was very keen on doing his Ph.D. He
was in search of a subject on which no one did any
research before! As he was thinking over it, he
found a cockroach on the table in from of him. He
decided instantly to do a research on the roach.
He picked the roach and put it in the centre of
the table and said: "Run". The roach ran. He
pulled out one leg of the roach, put it again in
the centre of the table and said: "Run". The
roach ran. He pulled one more leg of the roach,
put it again in the centre of the table and said:
"Run". The roach ran. This way the roach tried
to run even when it had just one leg. He pulled
last leg of the roach, put it again in the centre
of the table and said: Run". The roach could
not! Our Professor was satisfied with his study
and started writing his thesis: "When you pull
out all the legs of a roach, it cannot hear
anymore".