I am fascinated with the concepts of time travel, parallel universes and the Butterfly Effect. Fortunately for me, there are several TV shows today that deal with these things. One is Timeless and another is The Flash. The Flash is a Marvel comic based series in which the hero can run so fast that he can bend time. He can move both forward and backwards in time. Timeless follows a government team of time travelers who have to keep going back in time to prevent the ‘bad guy’ from messing with major past events and drastically changing the timeline.

In both of these shows, each trip back in time results in an altered present. In each, a seemingly random individual who is important to one of the main characters, is either dead in the present or was never born and no longer exists in the present timeline.

This brings up the Butterfly Effect, a theory popular with time travel enthusiasts. The theory, mostly used in science, states that a small change can result in a large, unrelated change down the road. In everyday life, this means that unimportant decisions, like whether to go out to dinner or eat in, can lead to very different ‘storylines’ in your life.

There is both a movie and a play that depicts the parallel universes created by a minor life decision. The movie is “Sliding Doors” from 1998 and stars Gwyneth Paltrow.

It tracks the different careers and love lives that the heroine would have if she a) catches a particular subway train or b) misses the train. For example, if she catches the train, she also gets home in time to catch her boyfriend in bed with another woman. If she misses the train, she also misses this tryst. Her life takes very different paths depending on that fluke of timing.

The play was a musical called “If/Then,” starring Idina Menzel. The show follows the heroine’s parallel lives if she either chooses to go to lunch with friend ‘A’ or if she chooses to go to a play with friend ‘B’ instead.

Interestingly, in both the movie and the play, the heroine ends up with the same ‘love of her life,’ just at different times in her life. Her career paths diverge but I think most people like to believe that some people are ‘destined’ to be together.

The Jewish concept of ‘Beshert’ says that every soul is a half soul and that there is another person in the world who is their perfect ‘other half’. So in time travel shows, many aspects of life are allowed to be affected by chance. But we don’t seem to want to accept that chance can also change the big things in life, like true love.

Some time travel writers have a different theory. They talk about the fact that the past ‘resists’ change. Rather than believing in the Butterfly Effect as it relates to time travel, many believe that at least the major events in history are more predestined and less susceptible to change.

It might seem easy to keep a major past event from happening, especially if small changes in the timeline can eventually result in big ones. But time travel writers feel events, like WWI, the assassination of JFK, or the sinking of the Titanic, will always find a way to happen, no matter how hard you try to prevent it.

You might want to read Stephen King’s brilliant book “11/22/63” about attempting to go back in time to prevent the JFK assassination. It was also made into a mini series, but the book is much better.

I guess it is easier to accept the idea that relatively small things, like the details of an individual’s life, are changeable and not ‘meant to be.’ Maybe this is because on a small-scale, cause and effect is more linear and knowable. On the other hand, historians are still arguing about the multiple and interrelated causes of the Civil War.

My grandfather was hit by a truck and killed when he stepped off a curb too soon at the age of 88. I used to obsess about what led him to that exact spot at that exact time. I used to imagine the tiny things he could have done differently that would have gotten him to that spot even a second earlier or later.

For about a year after that, I would imagine each time I reached a curb, that it could be my last moment on earth — if the stars were so aligned. Maybe this is the root of my love for some of these theories.