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"'Sometimes don't you think that things are just inevitable'When we study science, sometimes there are paradoxes that come our way.They might look exciting but also confusing at the same time.We've seen the movies like The Matrix,Predestination or perhaps the Netflix series Dark.This make us question our understanding and beliefs.What if the choices we made are not really ours?What if we are in fact in a dream?Or what if we are just caught in a time loop?Today we're going to talk about such a paradox,the bootstrap paradox.Let's get to the basics first.What is the flow of time To our current understanding,it is a continuous progress of events from the past that causes events in the present which will affect events in the future.Therefore, time always passes in a straight line with the future completely dependent upon events of the past and the present Now imagine a boy named Albert,who is a great patron of physics like you and me.He has always wanted to meet his idol, Albert Einstein.Now, somehow he builds a time machine along with the greatest minds of the world.One night, he sneaks into the la band uses the time machine to travel back in time to meet Albert Einstein.Now on reaching the time of Albert Einstein, he visits Einstein's neighborhood to ask about him:Where is he? And how he's doing?Little does he know, he understands that there is no Albert Einstein ever existed in that residence.Even surprisingly, no one has ever heard of the name 'Albert Einstein'. At first, he feels a little bit strange.What in the universe is going on?Fortunately, he remembers something.He carries a notebook containing all of Einstein's theories and equations.Everything from E=MC^2 to relativity.Still being stuck in that world, he then rewrites the book in the name of Albert Einstein:an idol that has been a lifelong inspiration for him.And then, some scientists picked up his writing and got really intrigued by the theory's inside.Over a period of time, those theories have been sensational and eventually they take the world by storm.He becomes famous and now he understands that he is and has always been the 'Albert Einstein'.So, how is that possible?Without Einstein, Albert wouldn't have been able to become a scientist in the first place.But without him, there would have been no Albert Einstein ever existed.And this is the meat of this episode.This paradox goes against our understanding of time.An event A in the past causes event B in the present which causes event C in the future.However, in this case it is event Which has caused event A in the past meaning that it doesn't fit with the linear explanation of time.'Time travel can be disorienting.Even short jumps can knock you around a bit'. Traveling back in time would allow for some causal loops, involving events,information or people and objects for which histories form a closed loop and seem to arrive or emerge unexpectedly.This is the essential problem of the bootstrap paradox.The notion of objects or information that are self-existing is very often viewed as paradoxical.And it doesn't stop there.The bootstrap paradox also violates the law of free will.Do we really have a free choice to build a time machine,or has it been ingrained in us in the first place?The most widely spread idea about it is a multiverse travel, which says:'When a time traveler uses a time machine,they do not go back in time.Instead, they travel towards another multiverse giving them the will to act freely in other universe'.'Do I..Do I have a choice?Of course, you always have a choice.Yeah but sometimes don't you think that things are just inevitable.Yes, the thought has crossed my mind.'Another problem that the bootstrap paradox present sis that it violates the second law of thermodynamics:'The entropy of the system will either remain constant or increase So an object used in a time loop will eventually wear down with time.Suppose that the entropy is altered as we go back in time and hence the object is back to its original entropy.However, its entropy does not have a clear state since it doesn't have a clear origin to begin with.And this is sort of give rise to new problems.Paradoxes like the bootstrap paradox and the grandfather paradox make many scientists like Brian Cox and Stephen Hawking believed that time travel is impossible.Hawking made this very clear in his books.He believed that there must be a law of nature to prevent time travel to the past.Time travel to the future is achievable, and even clocks in space do that.But time travel to the past cannot be possible.It would simply go against the law of nature.In which if we would be caught, it would violate all the laws of physics.'These events are happening in the correct order.The path you're on will take you to your destination'. Now if you want, forget all the hypothetical things I mentioned in this video.If I wanted to leave you with something, this would be it.Remember what I said before about the free will.Now reflected back in your life:Did you have the control of all the past decisions you made prior to this moment?Or were you under the control of a system, to behave and make your past decision in certain ways?This could be anything in your life, really.From going to college or even as small as watching your next YouTube videos.Because with some high-end out-of-the-world algorithms, in this day and age we can easily lose ourselves and end up asking:How did I get here?How did this happen?So next time when you face such a case,remember that you need to follow your will.And you're not just following what the society thinks you should do.Or the 'master' behind all this."