Carbon tetrachloride is a solvent which is used as a refrigerant and also as a cleaning agent. Today, methane
and chlorine are mainly used to produce carbon
tetrachloride:

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

clouds form

solid ice forms on leaves.

water droplets form on grass.