Joe, they do mention tide pools.

It's not really an improbability that the moon has the same apparent diameter as the sun but a coincidence that we are alive when it is the same. We just happen to be here to see it as it is as it's orbit gradually expands. Plus the moon's orbit isn't circular so at some points it's further away which results in an annular eclipse (saw one of those at sunset in the 90's, was very cool)

One thing I read said the we won't eventually lose the moon. One day billions of years from now the moon will reach geostationary orbit and will reside over one spot on the earth (the earth will always show the same face to the moon)