Reincarnation... in Scientific terms.... very interesting... Our body is composed of cells which in turn made up of Chemical molecules which in turn made up of atoms which in turn of sub atomic particles which in turn of some finite particles which may in the form of matter or energy or may not exist also (anti-mater). So when our body decomposes (even in our day to day life, we shed lots of death skins) it may become part of another body with or without life. So reincarnation is scientifically possible but whether our mind ( collective intelligence) as whole or takes in to new body with possibility of remembering after decomposing of body is not a proven fact. In Buddhist line reincarnation is very simple. It is just like igniting one candle with another. The new light may be part of the old one, but new one is not the same old one. When our brain cell dies (after certain age, our brain cells die gradually, which is one the reason for loss of memory in old age), we loose all the neural networks and loose all the so called conscious.