system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:If Water is just H2O, how come we can't just create a bunch of water in a lab from the abundant elements of Hydrogen and Oxygen?
gpt
We can but hydrogen isn't abundant. Its abundant in the universe. Its very hard to just find here on earth.

Edit: wanted to clarify. Pure Hydrogen is rare on earth. Obviously there is a ton of hydrogen here in things like Water. Thought that was obvious.