Hi,Death is the only ultimate truth in this world."Truth is other than known and unknown, known is the effect unknown is the cause" Swami Anubhavananda.I think soul = mass/c^2 where mass = our weight/gravity c= speed of lightEverything started from Shunaya(zero) even bigbang predicted that whole universe was contained in a point the size of 1/million the size of a pencil point. When a person or anything(live or alive) completes it's duration it splits to many forms and the purest of the component goes back to that Shunaya. This is where we go after we die. And this cycle goes on and on. The next form depends on how much light energy you have accumulated in this life. If you do good Karmas(deeds) you gather more light energy and next form will give you a good chance to perfect yourself more. If you gather less energy by doing bad karmas then next form could be an animal or reptile or bug etc etc . Once you perfect there you will move to higher forms.So death is nothing but start of a new life cycle. Bliss..Dinesh