If re-incarnation is a fact I have all sorts of awkward questions to ask, Like:

Where are all the souls stored?

How is the soul of a dead person assigned to another body?

Are there a finite number of souls in existence? How does the sytem adjust to population growth (ie. are new souls created out of nothing)?

Do other forms of life have souls (including bacteria and viruses)? If the answer to this question 'yes' are souls exchanged between species as Buddhists believe?

If only humans have souls what happened before humans existed and how and when did the re-incarnation 'system' come about?

What happens after the human race (inevitably?) becomes extinct? Will there be lots of 'redundant' souls with nowhere to go?

If there is life elsewhere in the Universe does each inhabited planet have its own self-contained system or can souls be exchanged between planets?

I can probably think of lots more questions - does anyone have any answers?