There’s a new theory in quantum mechanics about the paradox surrounding time travel. That is, if someone could travel back in time and alter history then this could affect the present.

Scientists claim that since this doesn’t happen – people don’t just disappear if their parents never meet in a revised history: either time travel is not possible or something prevents things from happening in the past that affect the future. Apparently it’s all about knowing the present. How much you know about the present affects what you can do in the past if you were able to get there.

However, I reckon that argument is flawed. It supposes that we would notice people disappearing. Which we wouldn’t, because everything, memories included, would be affected. What we consider to be ‘the present’ could be in a continual state of flux.

That’s assuming that we’re not just part of universal simulator where time travel is simply not allowed.