14/07/2016 Newsround

Afternoon, all, I'm Ayshah with Thursday's stories.

First up, it's one of the biggest games in the world -

millions of people are playing it and today, the mobile game

Pokemon Go has been released in the UK.

It's a game for smartphones that anyone over the age

of nine can play.

Players search the real world to find Pokemon characters

and capture them.

But there are safety worries - children's charity NSPCC says

players need to be careful near roads and to never speak

to people they don't know.

And if you want to know more about Pokemon Go

and how to play it safely, go and check out the guide

on at Newsround Online and there'll be loads more on Pokemon Go

on tomorrow's programme.

Well, it's been the first day at work for our new Prime Minister.

Theresa May took over from David Cameron last night.

Here's what happened.

We will make Britain a country that works not for the privileged few

but for every one of us.

That was the moment that Theresa May, the new Prime Minister,

walked into her new home, 10 Downing Street.

Mrs May has taken over as Prime Minister from the last

person in charge, David Cameron.

He decided to resign after the big vote, when the UK

decided to leave the EU.

Now, whenever there's a change of Prime Minister or government,

the person leaving and the one taking over have do go to see

the person leaving and the one taking over have to go to see

the Queen, so David Cameron, his wife and his children went

to Buckingham Palace to see Her Majesty and officially

step down from his job.

Theresa May was next in to see the Queen

and that was her big moment.

She became the new Conservative Prime Minister.

Mrs May left the Palace and returned to 10 Downing Street.

She will start work as only the UK's second female Prime Minister.

Her biggest job, sorting out how the UK leads the European Union.

Her biggest job, sorting out how the UK leaves the European Union.

Now to something big that's happening beneath

the streets of London.

Deep underground, a giant new railway line is being built.

It's taking 20,000 workers, 100 million hours of work and some

seriously big machines.

CBBC's super scientific reporter Fran Scott has been exploring.

I'm right in the centre of London at Farringdon station.

And it might look like everything is normal here,

but, beneath my feet,

the biggest building project in Europe

is going on - deep underground.

Welcome to the Elizabeth Line.

The massive project to build this new train line for London

started in 2009.

And in the summer of 2012,

while London was hosting the Olympics,

massive machines started digging.

It has taken well over 20,000 workers

over 100 million hours of work,

and they've had to move millions of tonnes of mud

from the 42 kilometre route.

The digging finally finished right here, where the tunnelling machine

called Victoria broke through to reach this -

what will become the new Farringdon underground station.

Now, they're working on getting seven new stations ready to open

in about 2018.

So, how do you go from this...to this?

It's best to ask an expert.

Chloe is one of many engineers working to make that happen.

So, an essential part of any railway is the actual track.

We're going to lay ours right here where we are walking.

So we won't be able to walk here in the future?

No - trains will be running through this tunnel,

picking up passengers and taking them to their destinations.

Chloe, this looks incredible. What is it?

This is a temporary shaft, it won't be part of

the permanent works.

We use them during construction to bring materials in and out

quickly and safely.

You just crane them in?

Yeah, pretty much.

That's brilliant!

This is one of our escalator tunnels here at Farringdon.

What you can see now is the final concrete lining being put on top

of the orange waterproofing.

Right.

This will eventually be one of the access points into the tunnel.

There are lots of parts that make up a working station,

but this one will not be ready for us to use for another 2-3 years.

Which is a good job because there are still lots to do.

Which is a good job because there is still lots to do.

So I better leave them to it!

Last up today, some people in Colorado in America are used

to seeing grizzly bears - but not like this.

Somehow, this bear managed to lock itself in a car,

despite not breaking any windows.

Don't worry, though, the bear was unharmed,

but the car was a bit of a mess.

That's all from me but it's a big day tomorrow for Tim Peake fans -

you'll be able to hear from him right here on Newsround

all morning.

Don't miss it!