>>> (Also, most liquids other than water get denser when they
>>> solidify, which is a big problem.)
>
>> Care to explain why?
>
>    If water had a higher density when it freezes (as happens with the vast
> majority of other chemical compounds), life on Earth wouldn't exist because
> all bodies of water would freeze from the bottom up, killing all living
> organisms.

Is it a requirement of life to have frozen water around?  Couldn't life 
start on a planet where there were areas that never froze (or at least 
didn't freeze for long enough for life develop sufficiently)?

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