Waching daily Oct 2 2017

Imagine an event (A) in the origin of our Minkowski diagram.

We want to investigate, what consequences this event could have.

If the event (A) sends out light, it can affect all possible events that take place along

the light's world line.

If (A) sends out a slower signal, like an accoustic signal, propagating with the speed

of sound, (A) can have an effect on those events that lie on this world line, like (B)

here.

This goes for all possible - that is, allowed - velocities.

What about here?

If there were an event (C) right here, then (A) would have to send a signal to (C), traveling

faster than the speed of light.

According to Einstein, that's not possible.

We conclude that every event above the light world line could have been - in principle

- caused by the event (A).

Now look at the Minkowski distance between (A) and (B), as well as between (A) and (C).

Between (A) and (B), the time component is greater than the space component, so s^2,

which is t^2-x^2 has a positive value.

The vector (A) to (B) is called timelike, because the events (A) and (B) are „timelike

separated".

This means, that there exists a frame, where (A) and (B) take place at the same position,

but no frame, where (A) and (B) happen at the same time!

Now on to (A) and (C).

Here, the spatial component is greater than the time component.

For the Minkowski distance s^2, this implies a negative sign.

The vector (A) to (C) is called spacelike, because the events (A) and (C) are „spacelike

separated".

We can draw a frame, where (A) and (C) happen at the same time, but none where they happen

to be at the same position.

What if (A) doesn't happen at the origin?

In this case, we draw the light world lines starting at (A) anyway.

Again, the events up here can be caused by (A), whereas those here cannot.

This construction is called the light cone.

In one time and one spatial dimension, it's more of a light triangle, but if we were to

draw two spatial components, it's really a cone.

The part above (A) is called it future, the part below is its past.

And everything else is called… elsewhere.

So let's recap: After drawing the light cone, we know that (A) can have an effect on everything

inside its future.

Everything in (A)'s past could've had an effect on (A) and any event elsewhere cannot

interact with (A) in any way.

That's pretty much it for this time, thanks for watching and see you next week!

For more infomation >> Causality & Light Cones - Duration: 2:50.

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Self watering Planter with a Plastic Bottle. - Duration: 5:33.

For more infomation >> Self watering Planter with a Plastic Bottle. - Duration: 5:33.

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A Day In My Life | Meetings With Production & Fabric Unit | Arpitharai - Duration: 7:22.

good morning everyone, Today I am going for full day meetings.

this is regarding the Wayanad clothing collection.

We are finalising the designs. we are going to meet production unit and fabric place.

It is 7:45 in the morning.

I'm going to meet Rob and Hannah in a while. then from there we all are going together

I'm hoping there should be less traffic

so I can reach on time. I'm supposed to reach by 8:00 but I am already running

late. today I'm going to take you along. I'll show you everything I am doing. the

whole day. let's go... Jacob's Well is an established Fairtrade fashion production

house in Bangalore. they provide empowering opportunities for vulnerable

women. this fits really well with Wayanad's vision of empowering rural Indian women.

so Wayanad chose to join hands with Jacobs well to reach same goal of

empowering women. I will leave a link of the website in the description box.

please go and check that out. we met Theresa there and discussed about

measurements, fabric consumptions based on the designs. you can see the

sampling unit there and that's Teresa. I had an opportunity to meet hard-working

women there.

so you do the cutting and you give it to the girl store and you instruct them to

stitch do you know how to use that's nice

thank you

so I think it was started about 20 years ago as like a charity initiative and

Brenda who wasn't there today but it's like she came over from the UK and was

on like an assignment was with Levi's that's their that was their first major

contract and the idea really was that I went into this air I think it actually

started in Mumbai that made its way down to angle the idea has always been about

giving people within women particularly within the garment industry better

working conditions better levels of pay so although that they're you know twice

as expensive as regular garment factory it's all about the standards of work

there and now so then after they had this contract with Levi's I come and

what to produce basically they've been working over the years to kind of move

away from the charities become more business and operate like a business but

I still rely on a lot of work that the charity brings in to them so they're

kind of bound by these rules actually of the charity set up set up initially I

think that's really the the main core of what they do

and it really works with that brand also exactly yeah we can tell their story as

well yeah then people find the clothes will yeah we just finished our meeting

with the Jacobs well we are going to thering anywhere we are going to decide

the fabrics that's Hannah and Rob you be a developing prints for our brand

collaborating with Theron Guinea Theron Guinea is home to some of the finest

blueprint artisans I leave the link for their website in the description we

finalized Donbass fabrics for all the designs

start with white Henry died black but the base died has to be reactive so

that it responds to this fellow yeah and then you take the demographic

and you convince the solute powder okay two days two days then you block print

with it so the print process remains the same but after the printing is one and

that's wherever that beast since at life that'll be the kind of reaction

tankini has great library of blocks this one here is a 70 year old brass block I

just reached home when I got in the post this one is for one of my DIY that video

very come soon the day was very productive we went to the manufacturing

unit and then we went to Turin Guinea which is a block printing place I didn't

know there is a beautiful place located in Bangalore it's like there's no

traffic's it's like a in the houses or in between the forest it looks so

beautiful if I have a choice I would stay there forever

such a beautiful place it's time to go make a tiara thank you for joining me on

my day if you are new here consider subscribing there will be very exciting

fashion related videos on this channel you can click that face below to

subscribe and watch other videos on this side of the screen until next time bye

For more infomation >> A Day In My Life | Meetings With Production & Fabric Unit | Arpitharai - Duration: 7:22.

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Treating Your Child's Cold - Duration: 0:31.

Hi, I'm Dr. Anita Chandra

with today's tip for kids from the American Academy of Pediatrics.

Young children can get 8 to 10 colds a year –

and while you can't make your child's cold go away faster,

you can help them feel better.

Offer plenty of fluids, run a cool-mist vaporizer,

and use over-the-counter fever reducers. Saline nose drops can help as well.

What doesn't help are over-the-counter cough and cold medications.

These have not been proven to work, and can be harmful.

For more on coughs and colds, visit HealthyChildren.org, and talk with your pediatrician.