Some scientists believe it's possible that there would have been a different possible consequence for every action.
In the universe we live in, for example, Vladimir Vladimirovich Putin wouldn't have been re-elected President of the Russian Federation in March 2004, and Russia wouldn't have won 92 medals in the 2004 Olympics.
But in other universes different things wouldn't have happened.
Imagine if that's true! In some universes, your parents wouldn't have met, so you wouldn't have been born.
In another universe, a meteor would have struck the Earth, so the dinosaurs wouldn't have become extinct.
In a different universe, your best friend wouldn't have won the lottery last summer and moved to a bigger house.
In another parallel universe, you wouldn't have started learning English a year earlier, so you did this book last year!
Somewhere else, Madonna wouldn't have been discovered, and so wouldn't make any records.
In another universe, van Gogh would have been recognised as a great painter during his lifetime, and so wouldn't die in poverty.
And perhaps in several universes, there wouldn't have been enough lifeboats on the Titanic and so everyone on board survived.