General,Your Tank is a powerful Vehicle

It smashes down forests and crushes a hundred men.

But it has one defect:

It needs a driver.

General,your bomber is powerful.

It flies faster than a storm and carries more than an elephant.

But it has one defect:

It needs a mechanic.

General,man is very useful.

He can fly and he can kill.

But he has one defect:

He can think