24/02/2016 Newsround

Leah here with Newsround, live on CBBC.

We've got today's best stories, including: The world's biggest

catapult fires again at Warwick Castle, and the boat

launched from America that washed up in Wales.

But first, Ant and Dec will be presenting tonight's Brit awards

in London where Adele's expected to the win the top prize -

She is also in the running for Best British Female.

Coldplay could make history if they win Best Group -

One Direction are also up for Best Group and Video of the Year

Justin Bieber, Rihanna and Little Mix are expected

And Martin will be there on the red carpet at 4.20pm this afternoon.

He'll be with fans waiting to catch a glimpse of the stars,

Take a look at this crane arm that collapsed and crashed to the ground

in Melbourne in Australia after a fire broke out

13 fire trucks were called to fight the blaze, which started

Next, how did this small wooden boat end up on a beach in Wales?

Well, it washed up after travelling nearly 4000 miles at sea.

A mysterious boat washes up on a beach in Wales.

There is no one on it, so where did it come from?

It's called the Carolina Dreamer and it's been at sea

At the beginning of February, these children, along

with their mum, spotted it floating towards them.

William was so excited, shouting there's a boat,

So I went in and pulled it out to get a better look.

Now covered in barnacles, the boat crossed the Atlantic

She discovered it had been launched by children at a school

in Charleston, in South Carolina in the United States.

I'm so happy for the children that were involved,

because they were just waiting desperately for news.

We've just had some lovely messages from them, really excited to hear

The schoolkids attached a tracking device to the boat and followed

the Carolina Dreamer on its 4000-mile journey.

It set off from the South Carolina coast in May last year.

It first landed on a beach a week later on the island of Bermuda.

It then relaunched on its way across the Atlantic,

around Ireland, and eventually into Cardigan Bay, Wales.

The school lost contact with it around ten miles to the north west

of Aberystwyth, unaware it had been found on Borth Beach.

When they found out it had been rescued, they couldn't believe

the Carolina Dreamer was still alive.

I was really excited that someone found our boat and that we don't

have to worry about contacting people about it any more.

Helen's already taken the boat to a children's school in Wales.

They hope to relaunch the Carolina Dreamer back

And Arsenal need to up their game if they're to reach

the quarterfinals of the Champions League.

Lionel Messi scored both goals, giving Barca a big advantage

for the second leg in three weeks' time.

German giants Bayern Munich threw away a two-goal lead to draw 2-2

with Italian champions Juventus in the night's other game.

It gives them a slight edge going into their second-leg match.

Manchester City take on Ukrainian side Dynamo Kiev later,

knowing they've never reached the quarterfinals before.

Dynamo haven't played a competitive game since early December.

Now to the massive fire-throwing catapult that's back in action

after being repaired at Warwick Castle in England.

It's the largest missile launcher of its kind in the world

and we were there to catch all the action.

It's made of wood. It's got a big wheel and a stick.

And it launches, like, big balls that are on fire.

Allow me to introduce you to the world's largest seize

engine, a huge catapult called a trebuchet.

Our machine is called Ursula, the bear.

She is designed to destory castles, towns and villages.

She stands at 18 metres tall and she weighs 22 tonnes.

The shots we launch from our machine would weigh around 150 kilograms.

Imagine two huge washing machines being thrown at you at 140mph.

This machine has to fire every six minutes, so my men must run up these

If the sun is pouring through the slats of the wheels

and they're looking at it, they're going to get dizzy.

And if they get sick, well, what comes out

A farmer's son from South Yorkshire has developed a robot that can find

weeds in crop fields and spray them with weed killer.

It has two cameras and a Sat-Nav to find its way around and he's been

trying it out on his dad's farm near Stocksbridge.

And finally, these window cleaners aren't scared of heights

but they did get stuck near to the top of a New York

Fire fighters eventually brought them inside through the windows

they'd been cleaning on the 62nd floor.

Remember, come back later to see Martin on the red carpet

with everything you need to know about the Brits.

Have a great day. I will see you tomorrow morning.