Why did Stephen Hawking ask that question on Yahoo!Answers anyway if he's so friggin' smart?

Question

No offence Prof, but seriously!

Answer 1

His batteries where running low on his voice machine and he needed to kill time. Either that or he finally discovered what a crock evolution is and he needs to start from the beginning

Answer 2

To induce thought about the subject amongst a greater portion of the common populace than the usual academics who've already dismissed him as delving outside of his expertise, perhaps.

Answer 3

He switches gears so seemlessly. General cosmology people love him. I once heard him say, "I wort, I wort. And the unieverse was tossed huh-pawn its end."