[MikeSeb]

Hmmm, without that hydrogen bonding, a bunch of biological processes don't work. So, without hydrogen bonding, none of us would be here.

Lets call it a tie.

Not a bad tradeoff, Nigel!

For some reason, though not much stuck with me from chemistry classes, I was always fascinated with hydrogen bonding--how it accounted for so many physical characteristics of molecules.

Water wouldn't be a liquid at room temperature without it, since most other substances with a similar molecular weight are gases. Fascinating.

No question, we aqueous humans wouldn't be around without it. Nor much of anything else as we know it.