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Dark Knight

Lemme though the prettier than pumpkin pies I know

What are we gonna do at the party doc? We're gonna play games. I'll give you a hint

He's really brave it must be me

Sorry

Donny said we could borrow Sir Kirby for the night

We're gonna play games

Snuggle in that sleeping bags it turn off the lights to tell stories oh

Excuse me

Did you say turn off the lights when Good King Donny goes to sleep?

He always keeps a little light on in his room. Huh well no lights here

Time to snuggle up and turn up the lights

I must ask you not to turn off that light

Indeed however. I meant mean dragons not nice ones like you

Are you okay

Yes, I'm not feeling very well at all I feel

shaky

sweaty actually

Sir Kirby your heart is beating really fast. That's why you're so sweaty

Sometimes when someone is breathing fast and shaking and sweating

But have you ever been scared?

The truth is doc when it's very dark it means you're afraid of the dark

What how can a brave knight be afraid of something?

Are you sure of your diagnosis lady McStuffins of this sleepover party?

fairly well

Greetings

I'm afraid of hurting people's feelings

I

Need to know exactly what caused your dark willies

Was there something you saw that scared you when the lights went out wait maybe in the dark that chair looks

Different will you be okay if we turn out the lights for just a second if you must know

Look, it's not a monster. It's just the way the chair and the jacket look when it's dark

By Jove you're right

Now when we turn off that light, it won't be so dark ah I think I'm ready to give it the old Royal truck

Let's count down

You're totally calm your heartbeat slowed down and you're not shaking anymore

And it's not scary at all

Once upon a time there was a good night sir Kirby sir, Kirby

How he gets an earful a real snowman just standing there in the middle of a summer day

What happened sorry chilly, but she could eat me I ain't had enough time

Are you okay

An ambulance at your service

Thanks chilly I think you're fine, but if it'll make you feel better is everything okay?

doc sorry guys

Shirley got knocked down, so I'm gonna give him a checkup. Oh

I said too much didn't I see?

Don't worry doc. We'll find her you can come on out Hallie games over oh

You found me

coming out

Plays and bumblebees am I the last one to be found well

Did you all hear doc : I think even the dog next door heard

Dog if I don't make it I want you to have my collection of snow globes and let Hallie have my hat

Otoscope please

Know what or what you gotta speak up doc

I know toys can break it all kinds of ways, but I can tell you there's no frog in my ear

Sorry I didn't mean to scare you do you need a cuddle?

It's okay Chilly's checkup is all done, baby. I'll fix them so you can hear all kinds of cool things

I'm supposed to be a nurse not a patient

Everybody needs a doctor sometimes

Besides all you have to do is close your eyes and raise your hand when you hear squeakers squeak ready has a rooster

sunrise doc

greet

Doc I'm getting great hippo has waiting for you to squeak

You're all done with your test

Huh so, I passed the test. What did you do?

Hyeyeon didn't Saturn clop them

Did it work

You have your stuff enosis

That means there's extra stuffing in your ear

Huh and that's my muffin in my ear

When there's too much fluff in your ears the sound can't get through

I'm gonna have to unstuff it. I'm ready doc

It's important to clean out fluff before it plugs up your ears

That's what I thought you said now that Hallie and chilly you're all better. Why don't we play a game?

We never did finish hide-and-go-seek

Hey there

You two are up giggling awfully late last night. No. I'm so tired

See what happens when you don't get enough sleep it can be hard to think clearly the next day

Some people get cranky and some people get Spacey

I

Think I'm Spacey oh

This tea is delicious

It's divine

It's better than divine. It's

yummy

Hi doc hi guys who wants some tea, Oh me me here you are mr. Stuffy

Stuffy hmm Susie sunshine, would you like to join us for some tea no?

don't

You're not acting like yourself today. Yeah, you're usually so giggly and happy and

Full of sunshine. I don't know, but it's true. I don't feel happy today

I think you need a checkup. Oh

The doc is in I

Don't feel like giggling oh my

Susie is not feeling like herself today. I didn't say that she didn't even want a party

This is serious. It'll help me figure out. What's wrong with you

Okay

Hmm, that's weird

What's weird?

Stuffy Lambie I see a yawn and I yawn

Hmm yawning very interesting Susie. Why don't you lie back?

Huh, that's funny, what's funny there, did you see that oh? I totally saw it?

So what was it again? Susie's eyes didn't close?

Yeah, that's exactly what I was gonna say

Susie when you lie down

Really really when you don't get enough sleep you can get Spacey or

Cranky, well, I guess it was a little cranky. Well, maybe a lot cranky

Doc did you unstuck my eyes?

What a super sleep I feel super duper, thanks doc

It's nice to see you so happy and full of sunshine full of sunshine

Mom are you Bush the monkey chased the weasel no monkey stopped to pull up his sock

Whoa that light changed quicker than I thought you okay?

Doc well I don't ever want anything bad to happen to you now that we're home. I think we should play dragon stomp

How do you play a?

big brave dragon

That's me stops through a city smashing everything he sees

I'm good pale belly has a face everything's here

Yeah, it flew so high. Did you see it? It was awesome

His star blazer zero still inside he's an alien astronaut. He flies rocket

Take me to your leader sugar if anyone's our leader, it's doc here

Oh, I am star blazer zero alien astronaut you may call me

zero

I'm doc McStuffins

We just have to put you back together everyone. Let's give zero hit and away

Hey watch your legs zero Casali my apologies

Huh Zoe how can I fly my rocket without arms or legs don't worry zero, I'll have you fixed up in no time

It feels good to have arms again you look much better and taller

Thank you doctor now. I can get back. It's my stethoscope. I use this to listen to your heartbeat

But I can't find it oh that's because I'm an alien

Zero this is

Perfect your legs seem to be working and honking just fine

Star blazer zero

Doc I'm ready

You

We know he broke again Hallie I need my doctor's bag you need a cuddle

Asking me not to fly is like asking this strangely soft lamb to stop cuddling

You

I think I have something in my doctors back that I can use to make a seatbelt 4-0

I'll just stick this in some watch me again. Doc watch me again. You got it

Hi Carlos, why is that because it's just about much time

For more infomation >> Doc Mcstuffins The Dark Knight Episode 14 - Pink Butterfly - Duration: 15:35.

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Dark Energy's Number | Cosmological Constant: Explained! - Duration: 8:56.

These are the Einstein equations. They belong to general relativity our current

theory of the behavior of macroscopic objects as well as gravity. But they didn't

always look like this. The Einstein equations were originally going to look

like this. But for a very specific reason this term was added. Spoiler alert!!

It was the acceleration of the expansion of the universe.

Let me explain. While Einstein was developing general relativity he was

asking astronomers at the time many questions, and something all astronomers

agreed on was that the universe were static and unchanging.

There was no start to the universe and there will be no ending this is how the

universe has always been and how it's always gonna be. There is no global

motion this is where the astronomical objects have always been. There may be

local motion, the earth is going around the Sun, but in the grand scheme of

things the universe is static. But this was bothering Einstein a lot. You see if

there was really no start to the universe, then his theory predicted that

gravity would eventually pull all matter into an infinitesimal point. So he

thought: But if every astronomer tells me the universe static it's more probable

that my theory is wrong instead of every astronomer in the world to be

wrong. So in order to fix his theory he had this term to his equations. Lambda

times G mu nu. This lambda is called the cosmological constant. Its purpose back

then was to counter the gravitational collapse. That way his theory would be

consistent with the astronomical observations. But in 1930 thinks changed.

Edwin hubble using the most powerful telescope at the time, made a

revolutionary discovery. He found that the universe wasn't static. It was

expanding. The further away he pointed his telescope the faster the galaxies

were moving away from us. So Einstein thought lambda wasn't needed anymore and

he removed it from his equations. But now lambda is back. Why? To explain dark

energy. We now know that the universe is not only expanding, but it does owe at an

ever-increasing rate. And the reason behind the acceleration of the expansion

is dark energy. Mathematically dark energy is expressed using lambda, the

cosmological constant. A positive value of lambda suggests an exponential

expansion of the universe. The current data that we have supports the idea of

a constant positive cosmological constant across the whole universe. Such

a thing would counter all the mass and pressure from the matter which would

gravitationally slow down the expansion. According to the second Freedman

equation with just Einstein's equations solved for the whole universe.

because of the cosmological constant we have a positive acceleration of the

scale factor, a double dot. Which means that the universe's expansion rate is

increasing. Without lambda the a double dot term would be negative, because the

density Rho and the pressure P of the universe both slow down the expansion.

But overall lambda wins and we have an accelerated expansion of the universe.

It's easy to underestimate the significance of the cosmological

constant and hard to overestimate it. Since lambda is dark energy's number and

dark energy is 68.3% of the universe. The reason why the

universe is how it is is mostly due to the cosmological constant. Lambda is the

reason the universe is flat. We derive that from the first Freedman equation.

The first Freedman equation is also a byproduct of the einstein's equations

solved for the whole universe and if you don't take into account lambda then the

first Freedman equation predicts that the universe has a negatively curved

hyperbolic spatial curvature. Because there is not enough matter, or I should

say density Rho, to stop the current acceleration of the universe that we

measure. Even without dark energy. If you include dark energy particles though you

find that there is enough stuff to flatten the universe. By including lambda

into Einstein's equations and as a consequence into the first Freedman

equation we get zero in both sides of the equation. Because cosmological

constant exactly cancels the right side from being negative. And that is

consistent with what we observe a flat universe, an Omega, the number which

describes the special shape of the universe, equal to one or more accurately

something between one point zero 28 and 0.9 72. So dark energy has two roles that

work against each other. First it introduces an anti-gravity effect which

fights and wins gravity from all the matter and results in an accelerated

expansion. But second it increases the density of the universe which helps

matter pull gravitationally the universe together by adding more stuff to the

universe. The former role is the reason why the expansion accelerates because

otherwise it will slowly decelerate but never reach zero. And the lateral role is the

reason the density of the universe is high enough to reach the critical

density and result in a flat geometry. So what is the value of the cosmological

constant? haha good question! Experimentally by measuring the

expansion rate of the universe and by analyzing the CMB, we have found that in

SI units lambda is 1.5 times 10 to the minus nine joules of energy per cubic

meter the average of one point 52 times ten to the minus nine and one point

forty eight times ten to the minus nine. This is the amount of dark energy a

cubic meter of vacuum has. So we know what lambda does we know what's the

value of lambda but what is lamda? What is vacuum energy? Well the leading

interpretation of dark energy suggests that this energy comes from quantum

fluctuations described by quantum field theory. But if you apply the quantum

field theory prediction of how much energy a cubic meter of vaccum contains

just from quantum fluctuations you conclude that lambda is 10 to the power

of 113 joules per cubic meter. See the problem? Experimentally we know

that lambda is 1.5 times 10 to the minus 9 but QFT predicts a vacuum energy of 10

to the power of 113. This is one of the biggest mysteries of physics. It is

called the cosmological constant problem. When we say that we don't fully

understand dark energy that's what we mean. And the worst part is we have no

explanation. But it may lead us the way to another revolution in physics.