Actually, because a human can simulate a Turing machine's execution using pencil and paper, humans are Turing complete. (I realize the original statement was that brains are Turing complete, but since each human brain usually come equipped with an attached human, it seems reasonable to discuss whether humans, rather than human brains, are Turing complete.)
I don't think I know a human who would have a zero error rate doing 1,000,000,000 Turing operations.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.