Of course it doesn't care. Man... I'm not expecting everyone to be a chemist, I'm certainly not, but how do people on Hacker News not know this stuff? I ask this with genuine curiosity. How old are you and what's your education?

Even pop science fiction like The Martian covered this stuff.

Again, I hope people don't offended as people often do when their knowledge is questioned. You all know stuff that I don't know. I'm just surprised because I thought this was basic stuff everyone knows.

Perhaps I misunderstood your original comment. I interpreted what you said as meaning that the hydrogen and oxygen atoms that make up an H2O molecule had to be derived from H2O molecules.

After all, your words were:

> oxygen comes from plants and plants get it from water and the hydrogen comes from hydrocarbon fuels where the hydrogen comes from water again

Then:

> technically you can never create new water on Earth

I asked the questions in good faith, even while knowing that the origin of the individual atoms has no bearing on whether an H2O molecule is H2O or not. I wanted to give you an opportunity to perhaps share something that the rest of us didn't know.

Your response was to ask about my education and how old I was, two data points that I can confidently claim have zero relevance on how water molecules are formed.

> technically you can never create new water on Earth

This is absolutely incorrect. Water can be created on Earth and is being created constantly from various processes. One of those processes: burning any hydrocarbon based fuels (aka, fossil fuels). You can see it for yourself - run any internal combustion engine and you'll see water dripping from the exhaust pipe.

Please pay more attention to the user names.