Protective Shield

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What is our protective shield to protect us from danger? All animals have protective shields like for example, the hedgehog. The hedgehog protective shield is "spines" all over his body that everytime an enemy come to attack, the hedgehog rolls into a shape of ball and "spines" will show all over its body to pierce the enemy. The snowhare and chameleon can change their body color to protect themselves from the enemy, so how about us? What is our protective shield from our enemy? Lots of knowledge? We are just only humans. We are defenseless if a psycho killer come to attack us. The only thing that we could do is to run or die in vain. I think, we are defenseless.