:00:00. > :00:00.Leah here with Newsround, live on CBBC.
:00:00. > :00:08.We've got today's best stories, including: The world's biggest
:00:09. > :00:13.catapult fires again at Warwick Castle, and the boat
:00:14. > :00:25.launched from America that washed up in Wales.
:00:26. > :00:27.But first, Ant and Dec will be presenting tonight's Brit awards
:00:28. > :00:30.in London where Adele's expected to the win the top prize -
:00:31. > :00:36.She is also in the running for Best British Female.
:00:37. > :00:38.Coldplay could make history if they win Best Group -
:00:39. > :00:43.One Direction are also up for Best Group and Video of the Year
:00:44. > :00:47.Justin Bieber, Rihanna and Little Mix are expected
:00:48. > :00:53.And Martin will be there on the red carpet at 4.20pm this afternoon.
:00:54. > :00:56.He'll be with fans waiting to catch a glimpse of the stars,
:00:57. > :01:02.Take a look at this crane arm that collapsed and crashed to the ground
:01:03. > :01:04.in Melbourne in Australia after a fire broke out
:01:05. > :01:08.13 fire trucks were called to fight the blaze, which started
:01:09. > :01:16.Next, how did this small wooden boat end up on a beach in Wales?
:01:17. > :01:19.Well, it washed up after travelling nearly 4000 miles at sea.
:01:20. > :01:28.A mysterious boat washes up on a beach in Wales.
:01:29. > :01:33.There is no one on it, so where did it come from?
:01:34. > :01:36.It's called the Carolina Dreamer and it's been at sea
:01:37. > :01:40.At the beginning of February, these children, along
:01:41. > :01:43.with their mum, spotted it floating towards them.
:01:44. > :01:45.William was so excited, shouting there's a boat,
:01:46. > :01:50.So I went in and pulled it out to get a better look.
:01:51. > :01:52.Now covered in barnacles, the boat crossed the Atlantic
:01:53. > :01:58.She discovered it had been launched by children at a school
:01:59. > :02:02.in Charleston, in South Carolina in the United States.
:02:03. > :02:04.I'm so happy for the children that were involved,
:02:05. > :02:08.because they were just waiting desperately for news.
:02:09. > :02:10.We've just had some lovely messages from them, really excited to hear
:02:11. > :02:15.The schoolkids attached a tracking device to the boat and followed
:02:16. > :02:19.the Carolina Dreamer on its 4000-mile journey.
:02:20. > :02:23.It set off from the South Carolina coast in May last year.
:02:24. > :02:28.It first landed on a beach a week later on the island of Bermuda.
:02:29. > :02:31.It then relaunched on its way across the Atlantic,
:02:32. > :02:36.around Ireland, and eventually into Cardigan Bay, Wales.
:02:37. > :02:39.The school lost contact with it around ten miles to the north west
:02:40. > :02:44.of Aberystwyth, unaware it had been found on Borth Beach.
:02:45. > :02:47.When they found out it had been rescued, they couldn't believe
:02:48. > :02:50.the Carolina Dreamer was still alive.
:02:51. > :02:54.I was really excited that someone found our boat and that we don't
:02:55. > :02:58.have to worry about contacting people about it any more.
:02:59. > :03:04.Helen's already taken the boat to a children's school in Wales.
:03:05. > :03:07.They hope to relaunch the Carolina Dreamer back
:03:08. > :03:17.And Arsenal need to up their game if they're to reach
:03:18. > :03:19.the quarterfinals of the Champions League.
:03:20. > :03:23.Lionel Messi scored both goals, giving Barca a big advantage
:03:24. > :03:27.for the second leg in three weeks' time.
:03:28. > :03:31.German giants Bayern Munich threw away a two-goal lead to draw 2-2
:03:32. > :03:34.with Italian champions Juventus in the night's other game.
:03:35. > :03:38.It gives them a slight edge going into their second-leg match.
:03:39. > :03:41.Manchester City take on Ukrainian side Dynamo Kiev later,
:03:42. > :03:44.knowing they've never reached the quarterfinals before.
:03:45. > :03:49.Dynamo haven't played a competitive game since early December.
:03:50. > :03:53.Now to the massive fire-throwing catapult that's back in action
:03:54. > :03:56.after being repaired at Warwick Castle in England.
:03:57. > :03:58.It's the largest missile launcher of its kind in the world
:03:59. > :04:01.and we were there to catch all the action.
:04:02. > :04:06.It's made of wood. It's got a big wheel and a stick.
:04:07. > :04:13.And it launches, like, big balls that are on fire.
:04:14. > :04:16.Allow me to introduce you to the world's largest seize
:04:17. > :04:24.engine, a huge catapult called a trebuchet.
:04:25. > :04:27.Our machine is called Ursula, the bear.
:04:28. > :04:29.She is designed to destory castles, towns and villages.
:04:30. > :04:34.She stands at 18 metres tall and she weighs 22 tonnes.
:04:35. > :04:38.The shots we launch from our machine would weigh around 150 kilograms.
:04:39. > :04:44.Imagine two huge washing machines being thrown at you at 140mph.
:04:45. > :04:48.This machine has to fire every six minutes, so my men must run up these
:04:49. > :04:52.If the sun is pouring through the slats of the wheels
:04:53. > :04:55.and they're looking at it, they're going to get dizzy.
:04:56. > :04:58.And if they get sick, well, what comes out
:04:59. > :05:20.A farmer's son from South Yorkshire has developed a robot that can find
:05:21. > :05:23.weeds in crop fields and spray them with weed killer.
:05:24. > :05:27.It has two cameras and a Sat-Nav to find its way around and he's been
:05:28. > :05:29.trying it out on his dad's farm near Stocksbridge.
:05:30. > :05:31.And finally, these window cleaners aren't scared of heights
:05:32. > :05:34.but they did get stuck near to the top of a New York
:05:35. > :05:40.Fire fighters eventually brought them inside through the windows
:05:41. > :05:45.they'd been cleaning on the 62nd floor.
:05:46. > :05:50.Remember, come back later to see Martin on the red carpet
:05:51. > :06:00.with everything you need to know about the Brits.
:06:01. > :06:02.Have a great day. I will see you tomorrow morning.