Infinity is one of those mind-boggling concepts that even manages to confuse some of the smartest scientists. But when it comes to the universe, is it infinite or just... big?
Fact is, it depends on how you're looking at things. Even if the universe is finite in size, it could perhaps be infinite. Wait, what? Watch this video to find out what's involved—because it can do a much better of explaining it that I ever could. [New Scientist]