0:00:05 > 0:00:08# If you've got a question and you don't know where to go
0:00:08 > 0:00:12# Ask Nina for some help Cos she's got a science show
0:00:12 > 0:00:15# She makes sense of her senses While helping all her fans
0:00:15 > 0:00:17# By doing her experiments with potions and with bangs
0:00:17 > 0:00:19- # Touch your tongue - Tongue
0:00:19 > 0:00:20- # Fingers - Fingers
0:00:20 > 0:00:22- # Eyes- Eyes - Ears- Ears
0:00:22 > 0:00:23- # Nose- Nose
0:00:23 > 0:00:26# Nina and the Neurons find out what you need to know
0:00:26 > 0:00:29# Nina and the Neurons find out what you need to know
0:00:29 > 0:00:32# Luke he helps us with our eyes and Felix with our touch
0:00:32 > 0:00:36# Ollie sniffs out smells and scents and Belle she hears so much
0:00:36 > 0:00:38# Bud is Ollie's brother He helps us with our taste
0:00:38 > 0:00:41# They're Nina's little Neurons and they're coming to your place
0:00:41 > 0:00:43- # Touch your tongue - Tongue
0:00:43 > 0:00:44- # Fingers- Fingers
0:00:44 > 0:00:46- # Eyes- Eyes - Ears- Ears
0:00:46 > 0:00:47- # Nose- Nose
0:00:47 > 0:00:51- # Nina and the Neurons find out what you need to know- Yeah!
0:00:51 > 0:00:54# Nina and the Neurons find out what you need to know
0:00:54 > 0:00:55# Oh, yeah! #
0:00:56 > 0:00:58Oh-ho-ho! Stop it!
0:00:58 > 0:01:01Oh, it's tickling! Oh-ho-ho! Hello there.
0:01:01 > 0:01:05Look at my new snake. Oh, I love him. Hee-hee!
0:01:05 > 0:01:09And he's got some friends. Ooh!
0:01:10 > 0:01:12Ah, they're all wiggly!
0:01:12 > 0:01:13BEEPING
0:01:13 > 0:01:15Oh! I hear a beep, I see a flash!
0:01:15 > 0:01:17I wonder what they're going to ask. Bye.
0:01:21 > 0:01:23- Hi, Nina!- Hi!
0:01:23 > 0:01:26We've got a question for you.
0:01:26 > 0:01:31There's a river near our house and it wiggles.
0:01:31 > 0:01:35Why are rivers wiggly?
0:01:35 > 0:01:37That's a great question. Why are rivers wiggly?
0:01:37 > 0:01:40This will be interesting to explore.
0:01:40 > 0:01:43Why don't you come down to my workshop and we'll investigate.
0:01:43 > 0:01:47See you soon, Nina. Bye!
0:01:47 > 0:01:50Bye! Well, I'm going to need some help to answer this one
0:01:50 > 0:01:52and I know just who to ask.
0:01:52 > 0:01:54OK, Neurons, time to get to work!
0:02:10 > 0:02:14- ALL: Neurons at the ready, Nina! - OK.
0:02:14 > 0:02:17Today's question is why are rivers wiggly?
0:02:17 > 0:02:19Which Neuron do you think will be most useful
0:02:19 > 0:02:21in helping us find the answer?
0:02:21 > 0:02:23- Me!- Me!- Me!
0:02:24 > 0:02:27Will it be fabulous Felix?
0:02:27 > 0:02:31I can help so very much if you need the sense of touch.
0:02:31 > 0:02:32Will it be beautiful Belle?
0:02:32 > 0:02:35I send messages to brain from ear.
0:02:35 > 0:02:37If there's a sound, I'll help you hear.
0:02:37 > 0:02:39Will it be lovely Luke?
0:02:39 > 0:02:41For looking and seeing, day or night,
0:02:41 > 0:02:44I'll help you with your sense of sight.
0:02:44 > 0:02:46Will it be awesome Ollie?
0:02:46 > 0:02:49If it's pongy or whiffy but you can't tell,
0:02:49 > 0:02:52- my messages help your sense of smell. - Or will it be baby Bud?
0:02:52 > 0:02:57Sour, salty, bitter or sweet, I'm your taste buddy whenever you eat!
0:03:00 > 0:03:03It's Felix and Belle!
0:03:04 > 0:03:07Go Felix! Go Belle! Go Felix! Go Belle!
0:03:07 > 0:03:11Go Felix! Go Felix! Go Belle!
0:03:11 > 0:03:14Today's question is why are rivers wiggly?
0:03:14 > 0:03:17Because we can feel and hear water flowing in rivers,
0:03:17 > 0:03:20Felix and Belle will be helping us today.
0:03:20 > 0:03:23But stand by, Neurons, I have a feeling I may need help
0:03:23 > 0:03:26from all of you. Right, I need to get the workshop ready
0:03:26 > 0:03:29before the Explorers arrive.
0:03:29 > 0:03:31Amelia loves ice cream,
0:03:31 > 0:03:34Patrick loves water fights and Radia loves to read.
0:03:34 > 0:03:37But they all want to know why are rivers wiggly?
0:03:37 > 0:03:41- There's a river near where we live. - It wiggles about.
0:03:41 > 0:03:44Why does it wiggle like that?
0:03:44 > 0:03:47So today, for one day only, Amelia, Patrick and Radia
0:03:47 > 0:03:49become the Explorers.
0:03:54 > 0:03:56- Hi, guys!- Hi, Nina!
0:03:56 > 0:04:00Welcome to my workshop and thank you for your great question,
0:04:00 > 0:04:01why are rivers wiggly?
0:04:01 > 0:04:04To find out the answer, let's start by using our senses.
0:04:04 > 0:04:09Whoo-whoo! A senses experiment! We're ready, Nina!
0:04:09 > 0:04:13First, let's have a think about rivers. What are they like?
0:04:13 > 0:04:14Moving water.
0:04:14 > 0:04:19Yes. A river is a lot of water that flows or moves.
0:04:19 > 0:04:23And rivers always flow in one direction - downhill.
0:04:23 > 0:04:24It's like a slide.
0:04:24 > 0:04:29If you were at the top of a slide, you would slide down to the bottom.
0:04:29 > 0:04:33But if you were at the bottom, you wouldn't slide uphill to the top.
0:04:33 > 0:04:34Just like a river.
0:04:34 > 0:04:38And some rivers have flat parts as well as downhill parts,
0:04:38 > 0:04:41but the water always flows in one direction.
0:04:41 > 0:04:43Here we have some pictures of rivers.
0:04:43 > 0:04:47And as you can see, some are straight and flat,
0:04:47 > 0:04:51some are hilly, and some are wiggly.
0:04:51 > 0:04:53Oh! I like that one!
0:04:53 > 0:04:55It's extra wiggly!
0:04:55 > 0:05:00Yes, it's very wiggly. Whoo!
0:05:00 > 0:05:01Ha-ha-ha!
0:05:01 > 0:05:05The ground at the side of a river is called a riverbank.
0:05:05 > 0:05:09And you should always be with an adult when you're near a river,
0:05:09 > 0:05:12- and you shouldn't go too near to the edge.- Very wise, Nina.
0:05:12 > 0:05:17Rivers start as small streams high up in the hills and the mountains,
0:05:17 > 0:05:21and they flow downhill and join up with other streams and rivers.
0:05:21 > 0:05:27Rivers keep flowing on and on until they reach the sea or a lake.
0:05:27 > 0:05:31And rivers are part of nature, like mountains or trees.
0:05:31 > 0:05:34- So who wants to make a river? - ALL: Me!
0:05:34 > 0:05:36- NEURONS:- We do, Nina!- OK, let's go!
0:05:38 > 0:05:43Here's our big hill, and it's made of sand and different sized stones.
0:05:43 > 0:05:46We're going to make a river using our watering cans.
0:05:46 > 0:05:49We're going to pour the water onto the big hill
0:05:49 > 0:05:52and watch what happens to the sand and stones.
0:05:52 > 0:05:53OK, let's get pouring.
0:05:59 > 0:06:02It's raining, it's pouring!
0:06:02 > 0:06:05What's the water doing to the sand?
0:06:05 > 0:06:09Look, Nina, the water is washing the sand down the hill.
0:06:09 > 0:06:10That's right, Felix.
0:06:10 > 0:06:13And did you see that some of the smaller stones
0:06:13 > 0:06:15were moved by the water, too?
0:06:15 > 0:06:18But what did the water do to the big stones?
0:06:18 > 0:06:20- It didn't move them.- That's right.
0:06:20 > 0:06:24The water can't move the big stones, so it goes around them.
0:06:24 > 0:06:27But it can move the sand and some of the smaller stones.
0:06:27 > 0:06:30And this is what happens in a real river, too.
0:06:30 > 0:06:33They pick up small stones and move them.
0:06:33 > 0:06:36Sometimes just a little way, and sometimes a long way.
0:06:36 > 0:06:38Ooh!
0:06:38 > 0:06:44Now we're going to pretend that this glass of water is a river.
0:06:44 > 0:06:47And look, here's the sand at the bottom of the river.
0:06:47 > 0:06:52But because the water's not moving, the sand is just sitting there.
0:06:52 > 0:06:54But water moves in a river,
0:06:54 > 0:06:58so I'm going to give it a little stir to move the water.
0:07:00 > 0:07:02Whoo! What's happening?
0:07:02 > 0:07:07- The water's moving the sand. - That's right.
0:07:07 > 0:07:11The sand is being picked up by the moving water, just like in a river.
0:07:11 > 0:07:14We know that rivers flow in one direction.
0:07:14 > 0:07:19Sometimes rivers can carry stones or sand or mud with them in the water.
0:07:19 > 0:07:24I love how they rush along very fast. Whoosh!
0:07:24 > 0:07:26They do rush along, don't they?
0:07:26 > 0:07:30And I think we need to go somewhere where there's lots of rushing
0:07:30 > 0:07:31to find out more.
0:07:34 > 0:07:37Hmm! Where do you think we're going today?
0:07:37 > 0:07:41Nina said somewhere with lots of rushing. Maybe it's a playground.
0:07:41 > 0:07:45- Children rush about there a lot. - I love playgrounds! Oh!
0:07:45 > 0:07:49Do you think there'll be swings? Swings are my favourite!
0:07:49 > 0:07:52Or a roundabout! I like roundabouts best.
0:07:52 > 0:07:57Hey! This is much better than a playground! Look!
0:07:59 > 0:08:02So, we found out that rivers flow in one direction,
0:08:02 > 0:08:05and they can carry small stones and sand with them.
0:08:05 > 0:08:10But now we're going to find out just how fast they can go. Look at that!
0:08:10 > 0:08:13We should be careful around water, Nina.
0:08:13 > 0:08:16You're right, Luke, water can be dangerous.
0:08:16 > 0:08:18Oh! It's going very fast, Nina.
0:08:18 > 0:08:23It is, Felix, and we're going to feel how fast it is.
0:08:23 > 0:08:27This is a water rapids ride, and rapid means fast.
0:08:27 > 0:08:31This ride has wiggly sides, just like a river.
0:08:31 > 0:08:34And in our boat we are going to be just like little stones
0:08:34 > 0:08:37getting swept along by the water.
0:08:37 > 0:08:40Now, we're going to see if our boat goes faster and slower
0:08:40 > 0:08:42at different times.
0:08:42 > 0:08:44So if we go fast, we'll shout, "Fast,"
0:08:44 > 0:08:47and if we go slow, we'll shout, "Slow." Let's go!
0:08:50 > 0:08:52Hello. Thank you.
0:08:56 > 0:08:58Yay!
0:08:58 > 0:09:01- Hold on tight, everyone.- Thank you.
0:09:03 > 0:09:05ALL: Slow!
0:09:05 > 0:09:07- NEURONS:- Fast!
0:09:07 > 0:09:08Whoo!
0:09:10 > 0:09:11ALL: Fast!
0:09:11 > 0:09:14- NEURONS:- Slow!
0:09:14 > 0:09:15ALL: Slow!
0:09:17 > 0:09:20- NEURONS:- Whoo!
0:09:21 > 0:09:23ALL: Fast!
0:09:25 > 0:09:26NEURONS: Fast!
0:09:26 > 0:09:27ALL: Fast!
0:09:29 > 0:09:31ALL: Slow!
0:09:31 > 0:09:32Whoo!
0:09:32 > 0:09:35That was you, that time!
0:09:35 > 0:09:38- That was so much fun, wasn't it?- It was great!
0:09:38 > 0:09:42And when the water was going fast, were we going fast or slow?
0:09:42 > 0:09:44- Fast!- Yeah.
0:09:44 > 0:09:48- And what happened when the water slowed down?- We went slower.
0:09:48 > 0:09:51We did. And real rivers do the same thing.
0:09:51 > 0:09:55At some points, they go fast, and at some points, they go slow.
0:09:55 > 0:09:57And when rivers move fast,
0:09:57 > 0:10:00the little stones under the water move fast, too.
0:10:00 > 0:10:04And when the river moves slowly, the little stones move slowly.
0:10:04 > 0:10:07Sometimes when the river moves really slowly,
0:10:07 > 0:10:11the little stones stop and drop to the bottom of the river.
0:10:11 > 0:10:14- What makes the river wiggle, Nina? - Ah-ha!
0:10:14 > 0:10:16Well, let's find out, Explorers.
0:10:18 > 0:10:23You asked why are rivers wiggly? And so far we've discovered that rivers
0:10:23 > 0:10:27flow in one direction, and they sometimes pick up sand and stones.
0:10:27 > 0:10:30We also found out that rivers go faster and slower
0:10:30 > 0:10:34at different times. But what makes the river wiggle?
0:10:34 > 0:10:37Well, we're here on a footbridge next to a real river.
0:10:37 > 0:10:40- Can you see the wiggles?- Yeah!
0:10:40 > 0:10:45And we have our very own wiggly river in this tray of sand.
0:10:45 > 0:10:48So let's see if we can spot the sand moving
0:10:48 > 0:10:50when our river flows downhill.
0:11:09 > 0:11:14- Look, Explorers, what's happening here?- The water is moving the sand.
0:11:14 > 0:11:19Yeah. When it moves fast, like here, it picks up bits of sand.
0:11:19 > 0:11:24But when it moves slow, like at the edge here, it drops them.
0:11:24 > 0:11:26The moving water changes the shape of the river.
0:11:26 > 0:11:28Wiggle!
0:11:28 > 0:11:33Moving the sand and tiny stones is what changes the shape of the river.
0:11:33 > 0:11:37And you know, rivers are changing shape very slowly all the time.
0:11:37 > 0:11:38Even this one is right now.
0:11:40 > 0:11:43- Rivers are brilliant, aren't they? - Yeah!
0:11:48 > 0:11:51So your question was, why are rivers wiggly?
0:11:51 > 0:11:53And I think we've answered it.
0:11:53 > 0:11:57I love to hear the water whooshing, and it goes in one direction.
0:11:57 > 0:12:00I liked it when we felt the water pick us up
0:12:00 > 0:12:02and move us along in the boat.
0:12:02 > 0:12:05When the water goes faster, it picks up sand and stones
0:12:05 > 0:12:07and moves them along.
0:12:07 > 0:12:11And when it goes slower, it drops them at the edge of the river.
0:12:11 > 0:12:14This builds a riverbank and makes rivers wiggle!
0:12:14 > 0:12:19They wiggle-wiggle-wiggle all the way to the sea! Yeah!
0:12:20 > 0:12:25- So, I hope that's answered your question.- Thanks, Nina. Bye!
0:12:25 > 0:12:27You're welcome. Bye!
0:12:30 > 0:12:33If you want to know more about the science that's all around us,
0:12:33 > 0:12:37go to the Nina section on the CBeebies website. Have fun!
0:12:37 > 0:12:42# Every day the sun comes up It brightens up the sky
0:12:44 > 0:12:46# A brand-new day to understand
0:12:46 > 0:12:50- # A chance to ask ourselves why - Why?
0:12:50 > 0:12:55- # There's a world of possibilities outside our front door- Front door
0:12:55 > 0:13:00# So every day take a look around and explore
0:13:00 > 0:13:03- # Explore,- explore,- explore,- explore
0:13:03 > 0:13:06- # Exploring in the garden - Grass
0:13:06 > 0:13:08- # Exploring in the park - Rivers
0:13:08 > 0:13:11- # Exploring in the daytime - Mountains
0:13:11 > 0:13:14- # And even when it's dark - Planets
0:13:14 > 0:13:17# Look at the Earth Look at the sky
0:13:17 > 0:13:20# Look at the world before us
0:13:20 > 0:13:22- # Explore,- explore,- explore,- explore
0:13:22 > 0:13:24# We're always on the lookout
0:13:26 > 0:13:28- # We're Earth explorers - O-oh o-oh
0:13:28 > 0:13:32- # We're Earth explorers - O-oh o-oh
0:13:32 > 0:13:35# We're Earth explorers. #
0:13:35 > 0:13:39And remember, exploring is about looking at the world around us,
0:13:39 > 0:13:41asking why and finding out the answer.
0:13:41 > 0:13:45So, whether it's deep underground, at the end of your playground,
0:13:45 > 0:13:49or way above the clouds, let's keep exploring our exciting world.
0:13:49 > 0:13:51See you again soon. Bye.
0:13:51 > 0:13:52ALL: Bye.
0:13:52 > 0:13:55Subtitles by Red Bee Media Ltd