According to the linked content, life on the Earth was once powered by sulphur. That's pretty wonderful news in itself, but I suspect that the exobiologists wil

According to the linked content, life on the Earth was once powered by sulphur. That's pretty wonderful news in itself, but I suspect that the exobiologists will feel much encouraged. I wonder why, over a billion years of this Sulphur Age, no large creatures have been found?