what if all clocks in the world stopped

time is set automatically by a program, but how does it know the exact time? time is set based on an internet connection.

people set up wristwatches before the

sale

but then how do these people know the

time

does anybody really know what time it is

hey there's a song there

anyway how do we determine this time and

what happens if all the clocks in the

world stop

wait a minute or longer

so welcome to the National physical

laboratory in Southwest London

here you can find some of the world's

most famous atomic clocks called

hydrogen mazers there are about 400 such

devices around the world and they help

the whole planet navigate through time

all modern Technologies satellites

operating systems GPS flight and train

schedules and the TV program on your

screen are Guided by the atomic clock

and here's how they work imagine a

pendulum it swings from one side to the

other one swing from left to right or

vice versa is a period of time equal to

one second

the pendulum is not very accurate since

it's not constant its movement may slow

down or accelerate

in atomic clocks atoms do the function

of a pendulum when they're exposed to

microwave radiation they begin to

fluctuate about 9 billion fluctuations

are equal to one second don't believe me

hey count them yourself the vibrations

of atoms are precise and unchangeable

these clocks are not lagging behind and

not accelerating

the error in such a clock can be one

second once every 10 million years now I

can't wait around that long so I'll take

my word for it

atomic clocks guide all modern

Technologies and communication

satellites and now let's imagine that

for some reason they stop working

atoms no longer react to microwaves

after them quartz watches and all

electronic ones stop

your phone no longer shows the time and

the arrival times of flights disappears

on the information board at the airport

at this moment all dispatchers contact

the pilots and ask them to land urgently

at the nearest airports further flights

become impossible

there are too many planes in the sky

if several start taking off and landing

at once at the same airport it can lead

to a disaster dispatchers wouldn't

create the correct schedule without

clocks

the same goes for all trains train

stations can no longer coordinate trips

and make switches on railway tracks this

system is too complex and can only work

with a precise time

the world is beginning to plunge into

complete chaos

the banking system is collapsing Brokers

don't transfer money to clients accounts

on time people can't get their salaries

on schedule

imagine you promised to send a

presentation to a client tomorrow at 2

pm and expect to get paid for it the

next day you don't know what time it is

and send the presentation to the client

two hours later

they don't get the file on time and the

deal falls apart

at large plants and factories the

schedule of the day gets down people

don't give out the necessary volume of

production imagine some Factory produces

two tons of processed Steel in exactly

eight hours

but the rhythm of work is disrupted and

this reduces the volume

next the steel should go to the ship

however the ship schedules are no longer

working either

and this applies to all materials in

general wood electrical carriers oil and

metals

logistic chains collapse because of the

stopping of the clot there's an economic

crisis and panic in the world

The Exchange closes and opens every day

at different times

shareholders and investors are losing a

lot of money

some say that the clock not the steam

engine was the most important mechanism

for the Industrial Revolution steam

engines powered cars and ships

but they couldn't synchronize the work

of many people

under such conditions you stop rushing

anywhere but so do all the other people

you can come to the supermarket and it

will be closed because its owner

overslept

but then when its doors open you'll find

that there are almost no Goods there

ships trains and trucks couldn't deliver

fruits Breads and vegetables because

they couldn't agree on the time

many will leave big cities as it'll be

challenging to live there without clocks

the age of high technology has ended

TV channels stopped working because some

employees were late and didn't start the

broadcast

the channel host came before the

operator but the sound engineer is still

sleeping because the alarm clock doesn't

know what time it is

to stop the chaos two things need to be

done the first is to accept that the

former high-tech life will no longer

exist

the second thing is to take an example

from our ancestors people live for

thousands of years without knowing the

exact time it has been necessary only

since the beginning of the Industrial

Revolution

before that people were Guided by the

Sun the roosters singing and the

internal biological clock

[Music]

for hundreds of thousands of years

humans used to go to bed at night and

wake up in the morning but with the

invention of the light bulb this order

was violated the industrial era forced

Humanity to focus not on the internal

clock but on the opening time of

factories and plans

then TV the internet and video games

were invented and the sleep mode

established by Evolution changed but in

a world without counting time people

will forget about alarm clocks again and

start improving their sleep

there will be a sundial in every house

the shadow will guide Humanity

hourglasses of various shapes and sizes

will be popular again in the world

sooner or later we will have returned to

some landmark in time as it was in the

past

[Music]

pimple in the 19th century people used

hundreds of different time standards

Railway schedules and buses determined

each of them

when the number of routes increased

people started sticking to the same time

that was sent in Greenwich UK

there was a big mechanical clock that

guided the whole country

Greenwich Mean Time or GMT Merchants

Factory directors and bankers adjusted

their watches according to GMT

when all UK trains were timed the GMT

signal was sent across the Atlantic via

an underwater cable straight to Harvard

in Massachusetts then at a special

conference in Washington DC more than 25

countries recognize Greenwich as the

international time standard

everything was fine the technology

worked synchronously worldwide but a

problem started after 10 years

scientists realized that the world

needed new clouds it turned out that the

Greenwich clock was inaccurate because

it was based on the time our planet

spent to make one spin around its axis

in the 20th century people learned that

Earth changed its rotation speed over

the years oh yeah it accelerates or

slows down because of the gravitational

influence of the Moon the Sun and other

planets and because of geological

fluctuations inside the Earth's core

scientists calculated that in 1900 the

Earth rotated four milliseconds slower

than at the end of the 21st century yes

there are people who watch this kind of

stuff

therefore people began to develop other

more accurate clots Atomic ones that we

still use but the strangest thing is

that even these clocks don't work in the

way people need

their main problem is excessive accuracy

Earth doesn't constantly rotate the same

way so workers sometimes add additional

seconds to the atomic clock or subtract

them and here's why

ordinary clocks are based on the

rotation of our planet when the time on

such a clock shows mourning it's also

morning outside

when the clock shows the late hour it's

dark outside

you're with me

our planet doesn't rotate at a constant

speed and the atomic clock is perfectly

stable

if the world always worked based on

these clocks

then time would sooner or later deviate

from the actual day and night

at some point the sun would begin to

rise at 6 pm and sunset would start by 7

am

to prevent this time Keepers change the

time on atomic clock slightly all of

this is necessary to preserve the usual

things for people so that the morning

hour on the clock and the street

coincide

well it's time for me to make like an

atom and split

that's it for today so hey if you

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