University of Queensland researchers say photons can move through time A simulation of two wormhole-travelling photons found they could interact This suggests, at the smallest scales, jumping through time is possible The experiment could solve some famous theories that 'prevent' time travel But whether this will be possible on a larger scale remains to be seen If a time traveller went back in time and stopped their own grandparents from meeting, would they prevent their own birth? That’s the crux of an infamous theory known as the 'grandfather paradox', which is often said to mean time travel is impossible -...