1. Time can('t) be rewritten.
2. Scientists have designed a Tardis.
3. The bees really are disappearing.
Colonies of honey bees began dying in their droves a few years ago, and scientists are not sure exactly why. Beekeepers and scientists are calling the phenomenon of apparently healthy colonies disappearing without a trace ‘colony collapse disorder’.
But they're not going back home to their planet Melissa Majoria. The disappearance seems to have been caused by the more earthly combination of parasites, agricultural chemicals, and poor nutrition.
4. And there really are cracks in the skin of the universe.
5. We've not quite invented the Tardis translation circuit... yet.
6. The scale of the universe means that surely there is some other life out there...
Without aliens, the Doctor wouldn't have much to do (well, given that he's an alien, technically he wouldn't exist at all). In the real world, we've found over a thousand planets outside our solar system in just the last 20 years. But in the few years we've been listening out for extraterrestrial lifeforms, we haven't heard a peep. That doesn't mean there is no other life in the universe. When you think about the vast scale of the cosmos, surely there is?
7. ...but we have no idea if we'll ever make contact.
Sadly, without a Tardis, we only have a small slice of space and time to explore. Our nearest star is a few light-years away, and we're nowhere near having light-speed travel yet, so we can't even get that far. If alien life is not close by, we might never encounter it.
But look on the bright side: Would you ever want to meet the Weeping Angels?