I recall wondering, long ago, how it is water (as a body) exists. In other words, I understand what makes a water molecule, but I do not recall ever seeing an explanation as to why these molecules stay together to form a body (should I say, a discernable body) or mass of water for slaking my thirst. I can imagine that trying to satisfy my thirst, molecule by molecule, would not be very satsfying.

Thanks, I've learnt a bit from you, you are much better at it than my teachers ever were (more than 60 years ago).
:)