[Zhaoman]

An article in New Scientist around the time of Christmas discussed this exact topic. The new LHC has enough power to create wormholes when 2 particles collide, something which hasn't been achievable until now. One explanation for why travellers from the future haven't visited us yet is because we have not had the capability to create wormholes in our past, and that 2008 may be "Year Zero" for time travel. Since we will have records of when we created the first wormhole, the article joked about how we will see a visiter from the future step out of the LHC when it fires up for the first time. Get your "I'm your grandaddy" t-shirts ready guys!