Question: What is time?
Stimulus: On November 24, 2013 an episode of Family Guy came out where the family’s dog Brian Griffin, was hit by a car right in front of his best friend Stewie Griffin, and died. The family decided to get a new dog name Vinnie, to replace Brian and the new dog just isn't any better. Stewie Griffin then encounter his past self at the mall and remembered that he had a time machine hidden in his backpack. (Which in the previous episode Stewie broke his time machine) He used Vinnie to distract the Past-Stewie long enough to steal the time machine and quickly travel back in time to the moment Brian was about to get hit by the car and saved him! “You’re alive, my friend!” Stewie tells Brian. “I couldn’t live without you so I came back from the future to save your life.” Brian responded “Thank you for saving my life, a lot of other families would have just gotten another dog and moved on.” Stewie finally returns to the future afterwards, and Brian woke up from his deathbed.
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Time travel is brought through movies and fictional books, it only exist in science hypothesis. It is believed that if anything could break the speed of light, there is a chance you will be able to step back in time. Though, there is enough substantial proof that we will never be exceeding the cosmic maximum speed and therefore any real discussion of traveling to the future and past, wouldn’t happen. Time travel to the past is impossible because the past and future doesn't exist the same way as the present does. The only thing that "exists" in a physical sense is the now. All the mass and energy and information keeps going along as the present, with nothing left behind. The "past" is just a mental convenience that helps us understand cause and effect between different states of the present, not a place we can go