Sleepovers with friends are always fun and exciting. But do you know what would make them more fun and somewhat thrilling? Adding a spooky theme to the whole thing.

The universe really is weird, which is bad news both for Albert Einstein and for would-be hackers hoping to break into quantum encryption systems. Eighty years after the physicist dismissed as "spooky" the idea that simply observing one particle could instantly change another far-away object, Dutch scientists said on Wednesday they had proved decisively that the effect was real.