It’s a great headline, based on two facts:

1) The Large Hadron Collider that will be switched on this year (fingers crossed it doesn’t wipe us all out – but if it does, you probably wouldn’t see it coming), could open up miniature wormholes, of the type that some believe makes time travel possible

2) Because of causality, one cannot travel back in time beyond when time travel was invented, otherwise your device would cease to exist

Unfortunately, the only time travellers that could visit would be sub-atomic in size, so we’ll never know. We need to wait until something like the TARDIS is built. When that is first used, we could expect millions of time-travellers arriving in our present, all at once!