I want to take you back about 10,000 years ago to the savannah in Africa. There are only about 1,500 human beings on the planet, and life is a scary existence. As far as predators go, we don't stand much of a chance. We don't have claws, or razor sharp teeth with fangs. We aren't very strong or fast, and we don't have any cool defense mechanisms like shells, venom, stingers, or even camouflage. Needless to say, it paid to be fearful on the savannah. Fear, vigilance, and worry kept us alive. Luckily for us, we got smart fast.