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Hi, Mirko here from Healthy Pet Systems.

Today I will tell you why do dogs bark.

So let's dive in.

First reason, greeting barking.

Dogs sometimes bark as a sign of saying "hello" and this is usually accompanied by a relaxed

body language and tail wagging.

Second reason, barking as a sign of territorial control.

When dogs notice people, other dogs or animals approaching their territory, their response

is usually excessive barking.

Third reason, barking to seek attention.

Sometimes dogs bark to seek attention or rewards like food or playtime.

It's the most common barking reason for puppies.

Fourth reason, socially influenced barking.

A dog can bark in response to the barking of another dog.

Fifth reason, barking because of an alarm.

Dogs do also bark when they respond to noises and sights.

This is not limited to the defense of their territory.

Ok, those are some of the reasons.

To find out more, I created a great guide about the dog barking problem.

In it, you will find 7 reasons why dogs bark, 9 ways to get your dog to stop barking, 3

devices that can stop the barking problem, and other tips related to dog barking problem.

The link is down below in a description.

If you like this video, hit the subscribe button to receive more like it in the future.

And remember let's keep our pets healthy!

Bye!

For more infomation >> Why Do Dogs Bark at Other Dogs And People? 5 Best Reasons - Duration: 1:49.

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Why do Indians spend so much on weddings? - Duration: 8:16.

Weddings are by nature an expensive ordeal.

If you are sponsoring a party for all your family and friends

well

that's going to cost you some money.

There's going to be the cost of a space,

and the cost of food

for the 50-100 odd people you invite to your wedding.

so yeah

by that definition you are likely

to incur an expense,

an expense that is considerably higher

than your average everyday expense.

But this is not the wedding

I'm going to talk about today.

The wedding that I am going to talk about,

and which is more common nowadays

is this kind of wedding.

The wedding of excess!

The wedding which begins with a

lavish invitation,

and a luxury box of exotic sweets.

An engagement party in the finest hotel in town.

An all-night bachelor's party

at a high-class pub in the city,

with unlimited booze and food.

Then a music ceremony,

posh place,

lots of people, lots of food,

lots of decoration.

A high-production bollywood style movie,

with the bride and groom as the stars,

shown to all the guests.

Professional entertainers,

magicians,

samba dancers,

acrobats

A full-night marriage ceremony.

A high-class venue for the wedding.

Maybe an exotic destination.

A beach

The hills.

An island?

Lots of food.

Lots of different kinds of food.

Indian cuisine

mexican cuisine

thai cusine

malay cuisine

vietnamese cuisine

indonesian cuisine

burmese cuisine

chinese cuisine

afghani cuisine

french cuisine

italian cuisine

Professional videographer

with professional cameras,

gyroscopes for stabilization,

drones for air-coverage,

professionally-edited videos,

Designer clothes,

designer bridal wear,

designer shoes,

designer head gear,

jewellery,

more jewellery,

lots of jewellery,

expensive decoration,

exotic flower,

exotic sweet smelling flower from South Africa

A band,

a horse,

a couple of horses more,

a chariot,

maybe a nice car, especially rented for the day.

Guests.

Lots of Guests.

500 guests.

No, a thousand.

No 2000 guests.

You have never met 1/4 of them ever in your life.

1/2 of them are mild acquaintances,

you wouldn't spend a dime on, on a regular day.

Only a handful of the 2000 guests actually mean something to you.

Only a handful of the 2000 guests, you care about,

and they care about you.

Typically a wedding like this costs somewhere between

THAT'S a lot of money.

Maybe a large fraction of the family's fortune.

In some cases it can be the entire lifetime

savings of the family.

In some cases people also take

personal loans to meet the expenses incurred in weddings.

So I guess the point is,

The answer is simple,

and we all know it.

I'm not saying anything new here.

It's a once in a lifetime opportunity

to show off your opulence to the entire society.

I found this quote online,

by a lady who works as a house maid.

But does everyone enjoy spending

their hard-earned money in weddings?

A lot of people do it out of peer pressure.

Because they are scared.

Fear is a devastating emotion.

But what are they afraid of?

What will people say if I throw a cheap-ass wedding?

It's hard! It's just so fucking hard

to not spend a fortune on weddings.

Can you imagine how painful it is

to not spend a fortune on weddings.

What I just said is so strange and so non-sensical.

Can you imagine how painful it is

to not spend a fortune on weddings.

This is such a powerful statement.

We have built this institution,

this system,

where our minds are forcing us to spend

our fortunes recklessly on one night.

Just blow away all our hard-earned money on meaningless stuff.

Just imagine what all we could have done with that money?

Buy a nice house,

spend the rest of our lives in that house.

Keep that money in the bank, in case an emergency strikes.

Go for a wonderful trip all around the world.

Quit your jobs and pursue that one hobby

you've always wanted to pursue.

So why do we feel compelled to spend our money on other people.

Feeding them all these different kinds of cuisines?

On a regular day

we wouldn't even spend a dime on them.

Because if I don't spend.

What will people think of me,

what will everyone think of me.

But if I spend. I'll be a king.

And people will think all nice things about me.

Wouldn't that be glorious?

But damn. I don't want to spend so much. It's just insane.

But what will people think about me

if I give a cheap ass wedding?

My daughter's wedding should be the best wedding in town.

So that everybody remembers me and everybody respects me.

Doesn't matter if I have to take a personal loan for it.

It's hard, man.

I think it has been very deeply ingrained

in our minds to spend excessively on weddings.

So deeply ingrained that

we think it's completely normal to do what we do.

like throwing trash on streets

In fact it just seems absurd

to not spend like a madman in a wedding.

It's like breaking some kind of

fundamental law of the society.

For example, if I tell you,

I want to quit my high-paying corporate job,

and do nothing for the rest of my life.

Just sit at home and read books.

Do a part-time job maybe.

Deliver pizzas maybe.

I don't want to work anymore.

Just live my life, relax,

do nothing, read books, and sit at home.

I have the money.

I have the house.

I have the books.

And I just want to sit at home

read those books and chill for the rest of my life.

There's nothing wrong with it. But

it seems like I'm breaking some fundamental law of the universe.

How can I do nothing?

How can I be nothing?

What will people think about me

if I am unemployed?

I am just 29 for God's sake.

What will the society think of me?

Everybody's doing something.

Everybody's someone.

It doesn't matter if I hate my job.

It doesn't matter if I don't need it.

I have to be something.

I have to be someone.

Otherwise I'll be an outsider.

I'll be no-one.

Because

Because no one values nothing.

Well, it's pretty much the same for weddings.

If you don't spend like a maniac in your wedding.

You are nothing.

You are no-one.

And it's hard to break out of that thinking pattern.

More so, when almost every other

human around you is behaving the same way.

We are a social species.

And if we do something

that is majorly different from the herd,

it causes anxiety.

It causes stress.

And so

I feel for everybody who has to go on this spending spree

during weddings so that they can be perceived as

'normal' functioning members of the society.

Because the sad truth is,

deep down somewhere,

we all know how abnormal this collossal waste of money is.

Well, as Mr. Gandhi once remarked,

So start by spending less in YOUR wedding.

And one by one if everybody starts doing this

then it will no will longer be the norm to spend excessively on a wedding.

So I repeat again.

If you want to see a change,

For more infomation >> Why do Indians spend so much on weddings? - Duration: 8:16.

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Why can't you escape a Black Hole? - Duration: 6:35.

If light doesn't have rest mass, why can't it escape a black hole?

Because nothing escapes a black hole.

Then how does gravity escape a black hole?

It doesn't.

What about Hawking radiation?

Nothing escapes a black hole!!

This episode was made possible by generous supporters on Patreon.

Hey Crazies.

There are a lot of misconceptions about black holes out there.

Let's see if we can fix a few.

We'll start with the one I hear the most:

The escape velocity at the event horizon is the speed of light.

Wrong!

That gives you the impression that, if you could somehow travel faster than light,

you could escape a black hole, which simply isn't true.

What's escape velocity?

A concept entirely in the realm of classical physics.

Say you've got a squirrel you want to launch into space.

With one momentary burst of acceleration, what upward speed is required for it to escape

Earth's gravitational pull?

That's the escape velocity.

Emphasis on the word "momentary."

A rocket doesn't work like this.

A rocket has continuous thrust, which isn't what we're talking about.

Instead we mean BOOM!

Suddenly the squirrel is going really fast.

Fast Fast!

After that, it's only affected by gravity.

We're even ignoring the surrounding air.

Physics Land!! Ah!!

I keep forgetting about that.

Anyway, how fast does this thing need to go to escape?

Well, considering the energy transformation, it comes out to be this.

G is a constant.

These two are the mass and radius of the Earth or wherever you're launching from.

Mars.

The Moon.

Whatever.

It seems pretty natural to take a concept like this to the extreme.

There should be some choice of R such that the resulting speed is the speed of light.

Except this would be wrong.

It's wrong because we wouldn't be considering relativity.

While Newton's laws apply to 99% of the things in 99% of the universe,

black holes and the speed of light are distinctly not those things.

They're in the other 1% of 1%.

When you take physics to its extremes, you have to use extreme models.

The friendly simple ones just don't work anymore.

We need to use general relativity, which says gravity isn't actually pull anything.

No, there isn't an invisible hand reaching out and grabbing things.

No, there isn't any transmission of information telling things what to do.

No, space itself is not falling inward.

According to general relativity, gravity is the curvature of space-time.

Gravity is geometry.

You might be picturing something like this.

Stop that right now.

Space isn't two-dimensional.

It's three-dimensional, so it looks more like this.

Although that still ignores time, which we really shouldn't do.

The space-time geometry around any non-rotating spherical object

is described by something called the Schwarzschild metric.

OMG! I actually said it right that time!

This tells us how far apart nearby events are in time and space.

You can see that depends on how close you are to the source of curvature.

Is it OK for that R to be in the denominator like that?

Nope. No, it isn't.

When denominators go to zero in a model, we call that a singularity

and, if you're paying attention, there are actually two of them in here.

If all the mass is compressed into a single point,

we get what's called a physical singularity at R=0.

But there's also this negative exponent, which means this term flips over

and we run into another problem at the Schwarzschild radius,

otherwise known as the radius of the event horizon.

Yes, the event horizon is a second singularity for the black hole.

We called it a coordinate singularity

because you can remove it with a change in coordinates.

Bottom line though, a distant observer sees a problem at the event horizon,

but someone falling into the black hole does not.

I did a whole video about this a while back.

Wait, isn't that Schwarzschild radius the same as?

No! No. It only looks the same.

Just let me explain.

Here's what we got earlier for an escape velocity at the speed of light

and here's the Schwarzschild radius.

Yes, they look the same, but that's just a coincidence.

While those results are the same, they were derived using completely different models,

which means they mean different things.

An event horizon has nothing to do with escape velocity.

An event horizon is about causality.

It's about time.

What happens as something falls into a black hole is difficult to understand,

at least until we add a time axis.

The squirrel's path through space-time would normally be straight upward through time.

This region represents all possible futures the squirrel could have,

the edges of which are the paths taken by light signals it might send.

But because of the black hole, the squirrel's actual future is curved.

As it falls in, more and more of its future points toward the black hole.

It isn't being pulled in.

It just goes in because that's where the future goes.

This is taken to the extreme at the event horizon.

Before the squirrel crosses the horizon, there are still some possible futures

that would allow it to escape.

It would just have to accelerate really hard.

Once it crosses though, all of its possible futures point inward.

Even if it tries to send signals, those will also go inward, no matter the direction.

It's a trap!!

Once you're inside, there's no such thing as outward.

It's like that house from Warehouse 13 where, if you try to leave,

you're just still in the house.

I'm scoring that an 8.5.

Next time, you've got to stick the landing.

So, how does the gravity get out?

It doesn't.

Have you even been listening?

Gravity is just what we call it when space and time are curved.

It doesn't have to escape because that geometry is already on the outside.

You're only trapped if you end up inside the event horizon

and the reason you're trapped is because all your possible futures point inward.

It's not that you can't escape.

It's simply that you won't escape.

Black holes don't capture objects.

They don't capture light.

Black holes capture the future.

Whoa Dude.

So was this clear enough for everyone?

Let us know in the comments.

Thanks for liking and sharing this video.

Don't forget to subscribe if you'd like to keep up with us.

And until next time, remember, it's OK to be a little crazy.

The most common question from the last video was:

What is momentum-space?

It's just a visual way to represent the random quantum motions of the neutrons

inside the neutron star.

Don't overthink it.

Anyway, thanks for watching!

For more infomation >> Why can't you escape a Black Hole? - Duration: 6:35.

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Why Do We Need a 23 Million Digit Prime Number? - Duration: 3:58.

You remember prime numbers right?

Numbers that can only be evenly divided by one and themselves?

Well it turns out finding prime numbers is not only useful for protecting data, but it

could make you money!

On December 26th, 2017, the largest prime number ever discovered was found by Jonathan

Pace of Germantown, Tennessee.

The number is over 23 million digits long, meaning I don't really have time in this

video or my entire life to list the whole thing out, but it's easier to call it by

its nickname, M77232917.

It gets this name because that's the exponent you raise 2 by to find it.

Oh, and don't forget to subtract one when you're done multiplying 77,232,917 twos

together.

Otherwise you just created a number you can divide by two and you'll have wasted all

that time.

Prime numbers found this way, by raising two by a prime exponent and subtracting one, are

called Mersenne primes, named for a 17th century French friar, hence the capital "M" in

the shorthand name.

3 is a Mersenne prime, since it's two to the second power minus one.

Same for 7, which is two to the third power minus one.

But the exponent has to be prime.

Two to the sixth power minus one is 63, which is divisible by 3 so, not a prime.

9 of the 10 largest primes found to date are Mersenne primes, not because they're the

most common -- the Prime Number theorem tells us there must be a simply huge number of undiscovered

primes between this newly found one and the next largest Mersenne prime -- but we find

them because that's how we keep searching for them.

In fact you can be a part of the search for the next one!

You don't even have to do the math yourself, just some software provided by the Great Internet

Mersenne Prime Search, or GIMPS!

The software uses the idle processing power of your CPU to run what's called the Lucas-Lehmer

test, where Mersenne numbers are checked against a specific set of numbers.

If the Mersenne number you're checking divides evenly into a certain number in that set,

then it passes the test and is indeed a prime number.

Obviously it takes quite a bit of horsepower to see if a 23 million digit number divides

into an even bigger number, which is why the project needs the public's help.

Almost 200,000 users are running the GIMPS software and if their PC runs a number that

passes the test, they could win money.

Pace is eligible for a $3,000 prize, and whoever finds a 100 million digit prime could win

$150,000 dollars.It's like cryptocurrency mining for those of us that can't afford

to buy a dozen graphics cards.

You may wonder why we bother searching for primes at all?

Why for the glory, of course!

We've only found 50 Mersenne Primes and next to almost every one of them is the finder's

name for all of nerdy eternity.

Plus prime numbers play a crucial role in keeping data secure.

One standard, RSA encryption, relies on multiplying two large prime numbers together to generate

a key.

Knowing the two primes that went into the key is the secret to decrypting the data,

but it takes an impractical amount of computational power and time to suss out what those numbers

are if you don't already know them.

So the key can be public and your data is still secure.

Of course since the Mersenne primes we've been finding lately are tens of millions of

digits long, these may not be the best candidates for encryption.

If you see a key that's an absolutely huge number, it won't be hard to guess which

Mersenne prime went into it.

Gigantic primes won't be useful until quantum computing is used to break RSA encryption,

and even then we may just use a different method of protecting data.

So there may not be much practical use in searching for Mersenne primes, aside from

winning that $150,000 for running a program while you watch youtube.

I gotta download that software when I get home.

Before you run off and download GIMPS, go ahead and subscribe.

And for more math, find out how ham sandwiches are helping us understand the universe, here.

The largest prime found by hand is M127, so we're obviously a bit past that by now.

Until next time, I'm Julian, don't forget to share that sweet prize money with me when

you win.

For more infomation >> Why Do We Need a 23 Million Digit Prime Number? - Duration: 3:58.

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Alex Sanchez: Why is Man Utd star not playing against West Ham? - Duration: 3:12.

 Sanchez travelled to London with the rest of the United squad yesterday. Boss Jose Mourinho gave no indication during his pre-match press conference that the Chilean was carrying an injury

 Mourinho is due to speak to the press ahead of kick-off where he will likely reveal the reason for Sanchez's absence

 The 29-year-old has struggled to make an impact at Old Trafford following his high-profile move from Arsenal in January

 WEST HAM VS MAN UTD LIVE UPDATES: FOLLOW THE ACTION HERE As an injury seems unlikely, it's possible Sanchez has been dropped for performance-related reasons, similar to the fate Paul Pogba suffered during the week

 Mourinho stripped the French World Cup winner of his vice-captaincy role and left him out of the squad for the shock Carabao Cup defeat at the hands of Derby

 The Portuguese coach was once again forced to defend his relationship with Pogba after footage emerged this week of a tense training-ground exchange between the pair

 Mourinho said: "I explained in detailed to the people that have to know, which is the squad and especially Paul," Mourinho said

 "So, Paul and the other players in the squad, they know in detail the reason why myself and my coaching staff decided to do that

 "I always analyse a player as a player. When a player is captain, I analyse the player by the player perspective but also by the captain perspective

 "And after weeks of analysing and changing opinions with my coaching staff, we made the decision that from now Paul is just a player and not a captain

"West Ham vs Man Utd starting line-ups MUFC: De Gea, Young (C), Smalling, Lindelof, Shaw, Fellaini, Matic, McTominay, Pogba, Martial, Lukaku

 Subs: Grant, Bailly, Mata, Rashford, Fred, Herrera, Darmian. WHUFC: Fabianski, Zabaleta, Balbuena, Diop, Masuaku, Rice, Noble (C), Obiang, Yarmolenko, Arnautovic, Anderson

 Subs: Adrian, Ogbonna, Fredericks, Perez, Antonio, Diangana.West Ham vs Man Utd - How to watch The match will be shown live on BT Sport 1 and BT Sport 4K UHD in the UK

 Pre-match coverage gets underway at 12pm ahead of kick-off at 12.30pm. Existing BT Sport customers will also be able to stream the match via the company's own site and their official app

 EE mobile customers can gain access to the game for free, thanks to a subscription plan recently announced by the network

 They said: "To say thanks for being with us, here's a special sporting treat for our pay monthly mobile and tablet customers: three months' free BT Sport on your EE phone and connected tablet

 "Just text SPORT to 150, register for a BT ID then download the BT Sport app and get watching!"

For more infomation >> Alex Sanchez: Why is Man Utd star not playing against West Ham? - Duration: 3:12.

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Why Do Knees Pop and Crack? - Duration: 2:25.

> There's some of the other symptoms of runner's knee because there's one in

here that I think... if your runner you've probably heard once or twice, I mean... I

certainly... I'm not a big runner but I mean I do it when I workout. The popping

or cracking sounds in the knee which we get a lot of that you'll get when you

come up and down and there's a lot of that. That's it's not necessarily

debilitating in any way don't tell us exactly what that is when we hear that

cracking though. > The Poppy are cracking could just be abnormalities in the

structure of our of our joint it doesn't necessarily mean that there's a

pathology, doesn't mean that there's anything that's being damaged per se.

It's kind of like driving down a bumpy road and that could be the surfaces of

your knee you're just going over a bumpy road and you okay it's it's hitting it

and it's it's um but it's not causing pain. So it could just be just how you're

built really so -- it's not arthritis or it is... is it a portent of arthritis -- It can

be this it's a very gener alized term to say that it's arthritis or to say that

the popping in my leg is caused by arthritis. Can it lead to arthritis

potentially could it be completely benign probably. > Let's take it from two

aspects the physical therapy that someone can do on their own

help them feel better and the physical therapy that you would put people

through in order to feel better. > The physical therapy that would need skilled

guidance typically is a is a injury that's been lasting longer than you

probably want to be dealing with, a lot of times runners over the years most

people don't just start running at a certain point they're like they've you

have been runners or develop a program hopefully they don't just go gung-ho and

start going to ambitious with there running because that's where you can

develop some other issues. But in terms of home rehab a lot of runners have

learned over time that... they've learned how to stretch they've learned how to

properly exercise they've learned how to just kind of treat themselves in a sense...

A physical therapist is typically used when those measures no longer work a lot

of people have the access to the Internet there's a lot of resources out

there that allow you to almost treat yourself but it's when you really can't

get to over that that hurdle that you need a physical there

source or another professional that could really help you.