Did The Past Really Happen?
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Did The Past Really Happen?


Hey, Vsauce. Michael here. The dog that played Toto in The Wizard of Oz was
credited as Toto, but in reality the dog’s name was Terry. And when Terry died in 1945 her owner and trainer Carl Spitz buried
her on his ranch in Los Angeles. But in 1958 the Ventura Highway was constructed
right through Terry’s grave. Her remains were disturbed and have never been found.
Fifty-three years later a memorial was erected in Hollywood
Forever Cemetery in her honor but because she isn’t burried there, the memorial is not a grave. It’s
what’s known as a cenotaph, an empty tomb. I was reminded of Toto’s cenotaph when I saw the cenotaph of Philopappos, atop the Hill of the Muses in Athens. You see, I was recently in
Greece talking about YouTube with YouTube
creators. The all seen eye of Guy came along and we
visited the Acropolis, a Lion Gate – nearly a
thousand years older than the Acropolis. The earliest known analog computer.
Plenty of beautiful cats and I even took a selfie in Delphi. I’ve seen all of these things and how old they were, it made me wonder how
will we be remembered. How will future archaeologists react to
the ruins of today’s society they find thousands of years
from now. Will they do a good job piecing it together? Will anything about you in
particular be remembered? And, for that matter, how do we even know that the past really
happened? Not just the way we think it happened,
but it all. Seriously, can you prove that the universe
wasn’t created last Thursday? That everything – every
person, every memory you have, every photo you’ve taken didn’t just pop in
into existence last week or five minutes ago? Last Thursdayism is the belief that
the universe was created last Thursday. It doesn’t have actual followers or rituals but proving it
wrong is impossible. Not because the universe actually was created last Thursday but
because Last Thursdayism is not also falsifiable. It cannot be shown to be false. In the
evidence you bring up against it can be explained away as part of the everything that was created last
Thursday. Many people believe that in order for a
theory and explanation to be scientific it must
be possible to refute it, to prove it wrong, to test it. So, instead, Last Thursdayism falls
into the domain of philosophy, where luckily there are razors – little rules of thumb that help shave off unlikely
explanations. The most famous is Occam’s Razor. When
faced with the choice between explanations, choose the one that requires diffused
assumptions. Occam’s Razor can shave off last Thursdayism because it requires fewer assumptions to believe that, say,
this beehive tomb was constructed way back in the
Bronze Age and that I just visited it later than it
does to believe that the tomb, my memories of it and this
footage of me inside it just happen to coincidentally
pop into existence at the same time last Thursday. One of my favourite
philosophical razors cuts off so much stuff it’s not even called a razor. It’s called Newton’s Flaming Laser Sword. It states if something cannot be settled by
experiment, then it is not worthy of debate. So let’s move on to the past. What does Newton’s Flaming Laser Sword tell us about the
past? I mean, it doesn’t exist in the same way gravity or light or protons do. We
can’t do experiments on it, build control groups, run trials. The past just is what it was. We will one day be the past and no
matter how well we try to record our stories ourselves, without time machines future archaeologists are
going to have to make a lot of guesses about us. But that’s kinda cool. Future humans will likely know way more
than us today about medicine, about exoplanets, about physics. But one thing they almost surely will not know more about than we do is today. Will your great great great great
grandkids know your name? Will aliens, who visit
Earth millions of years after humans leave or
go extinct, understand that Animorphs was just fiction, and not a history of our people? You are destined to become whatever the
future thinks you were, if you’re lucky. Vandals, fire, natural disaster, conquerors, thieves, all of these forces
obscure facts overtime, but no matter how well we tried
to preserve today for future history books, there’s
one type of fog we are unlikely to avoid. Apathy. Ira Glass put it well when he asked his listeners a simple
question: name 10 people from the 15th century. We have records of more than 10 people
but to most of us they don’t matter. In five hundred years radio host will be making the same jokes
but about us. However, there is a legacy
leave behind that is irreversible. Immutable, and in a way, unforgettable. To conserve energy, turn off when not in
use. Or just keep them on. Energy will be
conserved no matter what you do. Even if you leave
lights on all year, there will be no less or more energy in
the universe. What’s really being conserved when we
turn off lights are the resources we turn into energy the lights can use. But if you counted up all the energy in the system, before and
after turning the lights on, it would be the same. Energy also does
something else. Unless hindered from doing so, energy will spread out – it will disperse. That is, in so few words, the Second Law of
Thermodynamics. It’s how our universe works. It’s why
things that happen spontaneously do. Energy spreads. Even when a process locally concentrates
energy, like when a crystal forms or life grows, the Second Law isn’t violated because these
processes aren’t independent from the larger world
around them. They aren’t 100 percent efficient. Hindrances can hold
back the inevitable spread of energy for a long time. The Second Law doesn’t say when energy will disperse – just that when it can, oh it will. Balloons will deflate, objects will fall, hot objects will cool
down, and perfume sprayed across the room will
eventually migrate to your nose even in really still air. How much or how widely energy has spread out is
measured in entropy. Entropy is often called “disorder”, “chaos”. But entropy is very
different from macroscopic messiness. This deck of cards is themed after Greek philosophers. It’s
also arranged by value and suit – the entire deck. But if I
take the deck and shuffle it, that is, disorder it, I
haven’t actually increased the deck’s entropy, because nothing about this deck of cards’ energy is different than it was before.
However, entropy in the greater world around us has increased because in order to
shuffle the cards my body has to do work. It has to take
energy concentrated in my cells and change and disperse that energy into
kinetic energy, movement, and a little bit of heat from
my body and from the cards, friction, and a little bit of sound
energy – that rustling noise. So there’s your real legacy. Your contribution to the universe’s
growing entropy. No process will be able to undo the net increase in entropy you accomplish in your life. History may
forget you, or misinterpret your accomplishments, or
what stood for. The ripples you leave behind may get
redirected but the universe will never be able to
forget the entropy you add. That’s the law. The Second Law of Thermodynamics. Many scientists believe that this means
that eventually energy – heat – will be completely spread out evenly throughout the universe. It will be
the same temperature everywhere, and at that point nothing
will be able to happen. Because in order for something
to happen entropy needs to increase, energy needs
to spread, the move to change. This may be the ultimate fate of the
universe – thermodynamic equilibrium. The “Heat Death” of the universe. It’s been estimated that
at the rate things happen this end the universe will occur in about 8 googol years, and you’re contributing
to it by simply existing. A funny consequence
of all this is the fact that people who aren’t very active, people who don’t do much but lay around aren’t just being lazy. In a way they’re being considerate. Sloth maybe of vice, but to the universe it’s a fountain of youth. Choosing to do as little
as possible means consciously limiting your
contribution to the inevitable dispersal of energy and
thus in a teeny-tiny way postponing the “Heat Death” of our universe. Relaxing adds time to the universe’s life: in amount of
time, to be fair, almost indistinguishable from zero, but still theoretically real. Being lazy will make the universe last longer. So thanks for chilling out. Thanks for taking it easy. And, as always, thanks for watching.

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