welcome back my broskies that's right today we're gonna watch some poo dippy i do love
a bit of pewds i am a fan myself the word on the youtube streets is that pewds is going around
telling everyone the world's about to end and a little nerdy told me that he's actually done some
math in a recent video so you know i'm going to be all over that like pewds on a meme let's have a
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so basically same thing are you falling asleep this is interesting okay uh is it just me or is
edgar not the most relatable student ever we are with 95 certainly the last 95 percent of humans
who have ever lived within that group so basically same thing are you falling asleep i love how he's
just casually talking about our extinction to his dog if edgar can understand anyone can understand
us plus times a thousand and this becomes a thousand i've studied math physics stats for years
and i can confirm safely that all that just went over my head didn't he say if edgar can understand
anyone can here i am a physicist struggling to follow so if we assume our fractional position f
is evenly distributed here pewdiepie has more math in these videos than i do today
we're going to calculate the end of the world are doomsday with maps yeah at the end of the
day is this using probability and there are this is someone's comment not gonna lie it's
my third day watching it i feel sleepy after two minutes i'll pause sleep and resume the next night
this is why i don't show math in my videos i'm worried this will happen people will watch for 20
seconds to be like nah that's it i'm out i'ma head out we wanted to calculate the probability for
you're the worst okay i'm trying to explain this well there you go guys pewdiepie is more of a nerd
than me on one of his physics exams he scored highest out of 200 students what the hell guy's
probably better at physics than me jesus 1v1 me pewds let's go let's we've got all these youtube
boxes around let's have a physics death match i'm kidding that would be terribly boring and just be
the worst video ever actually this could be pretty fun we could do like a calculation contest where
we can we try to calculate really weird things and whoever gets the closest wins how much time
you spend in your life urinating force of a carrot falling at terminal velocity how
rich is harry potter the probability of norway's existence you'd be surprised you can actually get
pretty close with some of these calculations that sounds like a good idea to you help me out try and
get this video in front of pewds tag it in his pewdiepie reddit shoot it to him on our twitter
you know help me out like and subscribe do whatever you got to do let's make it happen if you
imagine two boxes they all have balls inside them that are numbered one box has a hundred ball since
damn don't talk about balls in front of edgar ed just just thinking yeah i used to have those
these two little stones got cut the poor little fella so fifteen thousand two hundred years
we have left to live edgar with ninety-five percent certainty what do you think of that
yeah so let's quickly summarize how pewds just gave us this really genius insight so basically
all he's done here is ask pull a bunch of numbers make a bunch of baseless assumptions and voila
we have an arbitrary answer of how the world when the world will end
i don't think we have much chance of making it out of this century let alone
15 000 years it's kind of cool that we can calculate our doomsday that's kind of epic right
n divided by n evenly distributed but what we can do to make it a little easier are you getting
bored to make it a little easier for us this video just would not be the same without that dog
probably pretty boring damn my videos must be pretty boring maybe i should get a pug just
bring them in all my videos please please this is important and we know with 95 certain accuracy
pewds seemed so excited for the end of the world i'm not gonna lie when i was young i used to
maybe i'm just like a psychopath or crazy but i used to always want something
big to happen like a zombie apocalypse or an alien invasion obviously that's not good a lot of people
would suffer and that's not good yes uh he uses the base theorem which is a really actually really
cool probability math equation wow i never expected to hear the words bay's theorem here
99.9 percent sure that we are gonna get a quick doomsday instead of a late doomsday i hope you're
all feeling prepared for this doomsday it's coming to a place near you so these doomsday arguments
are actually real things and they're put forward by astrophysicists cosmologists and they use the
anthropic principle anthropic reasoning and they also use bayes theorem so rather than
explaining that you can just go watch pewdie's pewdiepie's video because he does a pretty good
job of it or i'll link in the description a really good version by a much better physicist
than me on pbs space time and so he basically explains all that but so i'd rather just tell you
a couple things about bayes theorem and the anthropic principle you've got to be careful
whenever you hear base theorem because a lot of people misunderstand it and they use it to promote
superstition pseudoscience there's a lot of wacky stuff out there so be careful the most dumbed
down version of it is initial belief plus new evidence equals new and improved belief so it's
basically a method for calculating the validity of beliefs based on the best available evidence
and a really cool application of bayes theorem is something called quantum bayesianism so i
can tell you a bit about that now i've mentioned the interpretations of quantum mechanics before
on this channel and they all basically surround the wave function and how it collapses um and
this quantum bayesianism kind of swims alone on this one it's kind of way out there all the
other interpretations have something in common they treat the wave function as if it's part of
objective reality shared by multiple observers whereas cubism treats the wave function
uh as if it's part of a description of one observer's subjective knowledge
pretty awesomely it actually resolves all quantum paradoxes but not at the insignificant cost of
everything we might call reality but you know at the end of the day maybe what quantum mechanics
has been trying to tell us all along is that there's no such thing as objective reality and
objective reality is just an illusion but i will tell you i don't like this don't like it one bit
not a fan the potential for bay's abuse as i like to call it begins with this the probability of b
your initial estimate of the probability of your belief often called the prior in many cases this
prior is simply guesswork and it allows subjective factors to creep into calculations which
basically destroy the accuracy you might then be
guessing the probability of things like strings multiverses inflation god so you can see how
then you might begin to cite dubious evidence bayesians often claim that their methods can help
overcome confirmation bias and basically just give more accurate results but i have my doubts
bayesian statistics can't save bad science the anthropic principle is pretty cool and
it basically tells all theories of the universe that these theories have to allow for humans to
eventually emerge because we find ourselves in the universe so that must be the case just like bay
theorem which we talk about in this video a lot of people misunderstand it and use it to suggest all
kinds of wacky things and some people think it's evidence of multiverses but it's not this entropic
principle will be true regardless if there is or if there isn't a multiverse to give you an example
of the anthropic principle and how it actually led to scientific discoveries is a dude called
fred hoyle who basically you know realized we're made of carbon so the universe at some point must
create carbon and he basically used it to predict that an excited state of the carbon-12 nucleus
must exist at a particular energy which allows for three helium-4 nuclei to fuse
into carbon-12 in the inside of stars and so this basically then explained to us how all the heavy
elements in the universe formed and then five years later the discovery of both the theoretical
oil state and the process to form it which is the triple alpha process was discovered by a nuclear
physicist and i'm skipping over a lot of buzz terms here because they're really complicated if
you really want to understand them but i basically wanted to get to the point where we basically
understood where all the heavy elements in the universe come from including on earth and you
know all the stuff in your body as well so you are star stuff everything you're made of was
made in the interiors of stars and basically this all started with the anthropic principle
and using anthropic reasoning so it's a very valuable thing but like i said it's often used to
promote pseudoscience you've got to be careful 10 out of 10 video from pewds who would have thought
that you'd be teaching math i don't know about you guys but that was a pretty wholesome video just
a handsome swedish man teaching his sleepy little fluffball about doomsday don't know
about his conclusions or his mathematics but look it was fun thanks for watching guys if you enjoyed
the video make sure you like and subscribe and don't forget to send this video to pewdiepie