Should we tax or subsidize research into time travel?

Would time travel be a good thing for the world? Or would it wipe out our universe, creating a new timeline in which you and I might not even have been born? And as a result, should the government be supporting or hindering time travel research? That's the dilemma that econo-blogger Tyler Cowen struggles with, over at… » 1/14/11 7:00am 1/14/11 7:00am