Dust

Even dust provides an incredible function for mankind. If it were not for dust, we would never see a blue sky. Twenty-seven kilometres above this planet there is no dust from this earth, and the sky is always black. If it were not for dust, it would never rain. One drop of rain is made up of eight million droplets of water, and each one of those eight million droplets is wrapped around a tiny particle of dust. Without these, the world would become parched and life would cease to exist.