The Trouble With Time Travel

Time travel is what we call the notion of moving from one point in time to another, by means other than simply existing throughout the passage of time. If my present self were to somehow physically visit the past or the future, I would have achieved time travel.

Popular science suggests that time travel should be possible in some way, shape or form but the truth is, humans know too little about time itself to claim with much confidence that time travel is either possible or impossible.

We have...