09/08/2017 Newsround

Stick around for loads of top stories.

I'm Ricky and you're with Newsround.

On the way.

Who's the latest star to join Strictly?

And watch this mascot's epic fail!

First to the big argument between the United States

of America and North Korea, a country in the east of Asia.

So what do we know?

Here's Whitney:

Two men.

Two Koreas.

Warships, missiles and threats.

What is going on, and is it as scary as it sounds?

Let's start with the two Koreas.

One country is called North Korea, and the other South Korea.

They were split in two after World War II, fought a war

with each other shortly after that and haven't got along since.

And now the two men.

One is the leader of North Korea - he's Kim Jong Un, and he runs

the country just like his dad and grandad before him.

The other is Donald Trump, President of the USA -

a country which has supported South Korea for a long time.

North Korea is a country that has cut itself off

from the rest of the world.

Lots of things are run in secret there, and Kim has huge control

over people's lives.

He's also been trying to build nuclear missiles -

powerful bombs that can cause devastating damage -

that one day might be able to hit the USA.

President Trump wants to stop this happening and he's given a warning.

North Korea best not make any more threats to the United States -

they will be met with fire and fury like the world has never seen.

In return, North Korea has threatened US military

bases in the area.

So all of this is pretty worrying to many people around the world.

But there have been many arguments between the USA

and North Korea in the past - and although they've never been

friends, things have been worked out to stop a war.

Everyone's hoping that will be the case this time as well.

Meet Mark Beaumont.

He's on a mammoth mission to cycle around the world,

in a record-breaking 80 days.

And he's just reached the halfway point of his journey in Australia.

Here's Jenny.

Mark Beaumont wants to be in the record books.

Back in 2008, he cycled around the world in 194 days

and set a new world record.

His next adventure took him from Alaska in North America

to Argentina in South America.

In 2015, he cycled the length of Africa from Cairo

to Cape Town in just 42 days.

Nearly ten years on from his first round the world record,

it has been broken by other riders, and he now stands at 123 days.

This time, he is not trying to break the existing record

by a couple of days, that would be far too easy,

he is aiming to do it in just 80.

And it has not been easy.

The first day, putting miles in the bank feels great.

My front wheel went in and it was just a huge hole.

The first thing I felt was a broken tooth in my mouth.

I have chipped my canine tooth.

End of day 26 - that is the Chinese border.

This is the end of leg one.

I am in Australia, that has not sunk in yet.

I am here with my hot water bottle, with food, and I have

slept about 20 minutes.

It is an 18,000 mile journey in total.

Which means he will have to continue to bike more

than 200 miles each day, 16 hours at a time to

set the world record.

Watch this space.

We're weeks away from the start of Strictly Come Dancing 2017,

and the third of 15 celebrities, battling it out for the glitter ball

trophy, has been announced today.

And it's Ruth Langsford, a TV host on ITV's This Morning.

She joins Mollie King from pop group, The Saturdays,

and EastEnders actor, Davood Ghadami.

If you've been watching the World Athletics Championships

you may have noticed the event's official mascot.

Hero the Hedgehog - he's been trying to get

into the sporting action too.

Here he is trying to balance himself but can he make it?

No, he can't.

That's all from me, Newsround's back from seven forty

in the morning, with Jenny.

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