in Science: Hydrogen Harvesting Life Forms
The article is an interesting piece on bacteria that can survive without oxygen. The key finding of this discovery is the implications on evolution and oxygen’s role in it. It is currently thought that oxygen played the dominant role in the appearance of larger, complex, multicellular organisms. This article claims that it was not oxygen but hydrogen that played the dominant role.
While I believe the truth to be more of a combination of both sides than either individually, I think there is interesting evidence now to consider the possibility of life elsewhere in our universe where oxygen is not available. We seek Earth-like planets (which includes oxygen content) and look for life there, but what if we are missing life under our cosmic noses because we are not focusing as much attention on planets with less oxygen?
It will be interesting to see where this discovery goes.