The next time you feel down,remember that you are a part of one of the most resilient lifeforms that ever evolved on the planet.
How? Everything is constantly trying to kill us.For example,the hostile universe,with its huge doses of radiation,meteor showers and scare of collision with asteroids.Even the beautiful Mother Earth is constantly trying to kill us.She supports the growth of life and civilization but is constantly trying to snuff them out with earthquakes,tornadoes,volcanoes,etc.
Even our own bodies want to kill us.The heamoglobin,which is an important constituent of the human blood reacts with oxygen taken into the body to form oxyheamoglobin and supplies oxygen to the oxygen poor zones in the body.However,this heamoglobin prefers to react with carbon monoxide,a gas which is toxic to the human body,leading to the shortage or total blockade of the supply of oxygen to the body,which can result to unconsciousness or even death.
Also,look at how we've been able to subdue several forces of nature,we now understand the world better and modify it to suit our needs.If you ask me,"We rock!!!"