[tab][/tab]Following up on this, from a physics point of view - why can't there be spirits... or more likely, we often come across scenarios where people claim they remember things from their past life.
From a physics point of view? Physics is based on objective observation and measurable quantites. What is their about spirits which are objectively observable or measurable? Nothing. There for physics cannot say a single thing about them. The question is whether anything exists which is not objectively observable. Well do you believe that love exists? And I am not talking about some attempt to explain it away with psychological/biological gobbledigook. To believe in love requires faith, and there is nothing objectively observable about love of this sort. Is this a proof? Of course not. It is faith.
[tab][/tab]Now once our body+brain's dead - whichever way our bodies get destroyed - either cremation or by natural decomposition in a coffin, the atomic particles are assimilated into the atmosphere... Now what would prevent the same particles from getting transferred to a newborn foetus through some sort of carrier ?? Say through the soil - through the food the mom eats.. there can be 'n' number of ways this can happen..
Particles are very simple forms of energy described by mathematical equations in which there is no room for any memory of where they have been. In fact according to quantum mechanics, since these particles are interchangeable, they do probabilisically interchange. In other words, trying to identify particles which came from a particular source is meaningless because in short order it is shared out among all other particles in percentages.
[tab][/tab]Next, let us take into consideration - the concept of DNAs - if an ultramicroscopic chain of atoms can retain information (lets name it 'memory' in this case) and blueprint of the human body - the same way a group of atoms that got dispersed from the dead human might retain part of his memory too - either through some sort of grouping giving rise to a specific magnetic orientation.. or.. through some unknown principle that we haven't figured out yet...
The information stored in DNA includes nothing of what is learned by individual creatures - none of the experiences which are the content of our memories. The information stored in DNA is gathered in a time scale whose moments are generations and the only information it stores are the genetic variations that have managed to survive long enough to reproduce.
[tab][/tab]Maybe I wasn't able to explain this very clearly, but if you read through this - you'll surely see some faint vestiges of logic that can explain the whole concept of reincarnation and past-life's memory..
So to justify such beliefs as you are talking about, you must as I said before, believe in the existence of things which are not objectively observable or measurable (as I do). To believe that memories are passed on, means that you must believe in something which contains these memories that continues to exist after the death of the body and mind - that which is commonly refered to as the spirit. But where do spirits come from? Are they objects created elsewhere or are they created by the process of life itself. If they are created elsewhere then are they lying in wait to posess infants which are born (pretty creepy if you ask me) or are the stuffed into the infants like inanimate objects by some higher being?
If they are created elsewhere then is there an infinite supply or is there a danger of running out, or they manufactured as needed to meet the needs of a growing population? Since this idea of being created elsewhere generates more questions than it answers then the idea that they are created by the process of life itself seems much more reasonable (and less creepy) to me, and any "phenomenon of reincarnation" is simply the transfer or sharing of past memories between spirits of those departed and those still alive.
Well I guess it is a matter of taste I suppose. Perhaps some people prefer to believe that their child is an old soul simply rediscovering the things of life, trying once more to do it right, while others like myself prefer to believe that their child is something absolutely new in the world with a completely unexplored range of infinite possibilities.