[Gayle]

I'm not convinced there is a 'why'.

Some people choose not to have children, some people can't, so the reason can't be 'to procreate' as it would be a lot easier. It's unlikely to be because there are better things ahead of us in the afterlife because I think we would have been told - you can't offer a reward without actually offering it, I think that's just our wishful thinking. We can't be here to spread our knowledge or why would some people be so overidingly thick? And finally, if there are aliens, do they have the same 'why' as us?

There's no reason - we're just here! Science had a bit of a quirky day and produced a planet that could sustain life!