My favorite chemical number two are tetenus and halo. The bring about heat, cold, salt etc.

Chemicals are salt, sulphatic acid, ammonia etc. But this are old chemical and are studied and understood by all people may manufacture in many companies as well. 

All diseases are history already by now. The is none real e.g. flew, coughing, head pain etc. 

Computer has become a thing for creating job, writing program, education etc. That is a good change i wise every can see that but so does it badly on our health. 

Salt comes from light, ash and dews. It takes time to form but when it is form it is hard to loose it from any surface. 

We human have come from Galaxy. What if you asked where do we come from i.e. where is our starting place? Some could answer that we come from soil, but the soil become us in away. This implies that when things mixed and the planets begin to form we were already there and that become our home. Imagine that asteroid can burn up without the present of sun. Then how do we become alive? You can also argue that we light so when soil burn up we become light then later we became soil then we became human. 

You can say that Being belong in same place as soil. They become different because of the body type and the system they owe. they initially comes from same place but the bigger the soil comes and the cooler becomes so does more being comes. Being become multiples because they becomes breading experience.