We fall sick many times throughout our lives. When the events of "sickness" and "recovering" take place, our bodies become a battleground in which a bitter struggle is taking place. Microbes invisible to our eyes intrude into our body and begin to increase rapidly. The body however has a mechanism that combats them. Known as the "immune system", this mechanism is the most disciplined, most complex and successful army of the world. This system proves that the human body is the outcome of a unique design that has been planned with a great wisdom and skill. In other words, the human body is the evidence of a flawless creation, which is the peerless creation of Allah.