I find it extremely interesting, and probably significant that there are so many physics constants
that if changed only a little would have made life impossible. One I reaad in Scietific American I think
many years ago, is the fact that when water freezes, just before it solidifies it expands enough
to lower its specific gravity enough that it floats.Otherwise the oceans would have become solid
ice, with only a few feet of water on the surface, and life in the oceans would be impossible, except
for algae and other microscopic forms.