:00:00. > :00:08.Hi, I'm Ricky, and you're live with CBBC this Tuesday morning.
:00:09. > :00:13.Coming up on Newsround in the next few minutes:
:00:14. > :00:22.We're on the red carpet with the stars of this year's Strictly.
:00:23. > :00:38.And the policeman showing off his dance moves in London.
:00:39. > :00:49.Flooding in the US city of Houston in America
:00:50. > :00:51.is expected to get worse today, after more rain was forecast.
:00:52. > :00:53.Thousands of people have been rescued from their homes
:00:54. > :00:56.after Tropical Storm Harvey battered the city, and many more
:00:57. > :01:00.Later today, President Trump will visit Houston to see the damage.
:01:01. > :01:01.Newsround has spoken to Emilio and Thomas,
:01:02. > :01:04.It started flooding the neighbourhood.
:01:05. > :01:13.And me and my dad and another person took a boat ride on the flood.
:01:14. > :01:17.My school is out for a week and a half because of weather like this.
:01:18. > :01:20.We're going to be having to take in some of our friends that
:01:21. > :01:28.I know friends that the water's up to their driveway,
:01:29. > :01:30.and one of our friends is about to get flooding
:01:31. > :01:33.in their house pretty soon, so it's kind of a scary experience,
:01:34. > :01:49.Showbiz now, and Strictly fans, this one's for you.
:01:50. > :01:52.All the celebs have been revealed, and it's time for them
:01:53. > :01:54.to take to the dance floor for the first time.
:01:55. > :01:57.Luckily not in the ballroom but on the red carpet.
:01:58. > :01:58.Ayshah went to see them strut their stuff.
:01:59. > :02:02.It's that time of year when the glitterball is dusted off.
:02:03. > :02:05.We're here on the Strictly red carpet.
:02:06. > :02:10.And it's safe to say that this year's group of Strictly stars can't
:02:11. > :02:13.It's going to be huge, because people who've
:02:14. > :02:16.watched me on Top Class or The Dog Ate My Homework
:02:17. > :02:18.are used to seeing me in a very different way.
:02:19. > :02:27.We are actually going to do the show.
:02:28. > :02:37.It's started already, and we have been getting
:02:38. > :02:39.ready since about ten o'clock this morning.
:02:40. > :02:42.We are all in our sparkly outfits, even the boys.
:02:43. > :02:47.I have sequin envy because Jonnie Peacock has got multicoloured
:02:48. > :02:51.This is not something that I would never normally do.
:02:52. > :02:54.But I think that's really good for me to challenge myself.
:02:55. > :02:57.But despite the excitement, everyone seems to be a little
:02:58. > :03:06.Do you know what I'm really nervouc about is doing a dance
:03:07. > :03:14.I'm quite nervous about the possibility of forgetting
:03:15. > :03:29.I don't want to just go flat on my face.
:03:30. > :03:35.Running upstairs in heels, and the fact that the camera is on you...
:03:36. > :03:45.So if you see me doing that, something's gone wrong.
:03:46. > :03:48.That's it for the red carpet, but it won't be long till we find
:03:49. > :03:50.out who the celebs' partners are, and then those Twinkletoes
:03:51. > :04:05.This month marks ten years since hashtags have been
:04:06. > :04:09.But have you ever wondered were they came from and why we use them?
:04:10. > :04:15.They're used not just online but in everyday life.
:04:16. > :04:20.Did you know the hashtag symbol first popped up in the '70s
:04:21. > :04:26.and was used by computer experts as a way to make notes in coding.
:04:27. > :04:38.And by the '90s, the symbol was used by the Internet relay chat.
:04:39. > :04:40.That's an old messaging app that used hashtags
:04:41. > :04:44.2007 was the birth of the hashtag as we know it.
:04:45. > :04:47.That was the very first time hashtags were used on Twitter
:04:48. > :04:50.And this became the normal way that people tweeted.
:04:51. > :04:53.Other social networks like Instagram, Facebook and even
:04:54. > :04:58.The word hashtag is now even in the Oxford English Dictionary.
:04:59. > :05:00.Hashtags are used in everything from elections...
:05:01. > :05:14.and even massive TV shows use it to get people talking.
:05:15. > :05:16.Now people from all over the world connect using
:05:17. > :05:24.Hashtag Newsround #historyofthehashtag!
:05:25. > :05:29.Finally to the star of this weekend's Notting Hill
:05:30. > :05:35.It's PC Daniel Graham and his body popping skills.
:05:36. > :05:37.Yep, he's a real policeman, and this video of him dancing
:05:38. > :05:39.at the festival has gone viral, with hundreds of thousands
:05:40. > :05:48.And get this - it turns out PC Graham was also a contestant on last
:05:49. > :06:02.Newsround's back with Jenny at 4:20 this afternoon.
:06:03. > :06:05.My favourite shows are Horrible Histories...
:06:06. > :06:09.and I really like Wolfblood, too,