Scientists at Griffith University in the US and the University of Tokyo in Japan have successfully carried out an experiment which should once and for all prove that a particle can indeed exist in two places at once.
Described by Einstein as "spooky action across distance", the theory goes that a particle in superposition can exist in two places at once. It is only when you try and measure one of the particles that its counterpart disappears.
As ludicrous as that sounded, that wasn't actually the problem that Einstein had with the theory. His real aggravation was focused around the idea that the reason the counterpart disappears is because somehow, it knows that its partner has been discovered.
This would require a level of connection that would travel faster than light and as such, Einstein just wasn't convinced.
Well it turns out that even though we still don't know how the particles know each other, you can indeed split a photon on half, send it to two separate locations and then have it exist in 'superposition' until it's discovered and measured.
Now if you fancy going even deeper than our somewhat simplistic explanation then there's a rather handy video at the top that explains the whole thing, although we'd recommend you have a seat first.