0:00:06 > 0:00:08# If you've got a question And you don't know where to go
0:00:08 > 0:00:11# Ask Nina for some help Cos she's got a science show
0:00:11 > 0:00:14# She makes sense of her senses While helping all her fans
0:00:14 > 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 > 0:00:30# Nina and the Neurons Find out what you need to know
0:00:30 > 0:00:32# Luke, he helps us with our eyes And Felix with our touch
0:00:32 > 0:00:35# Ollie sniffs out smells and scents And Belle, she hears so much
0:00:35 > 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 > 0:00:50- # Nina and the Neurons find out What you need to know- Yeah!
0:00:50 > 0:00:53# Nina and the Neurons Find out what you need to know
0:00:53 > 0:00:55# Oh, yeah! #
0:00:56 > 0:00:59Boing! Boing! Boing-boing! Hee-hee!
0:00:59 > 0:01:01Oh, hello there.
0:01:01 > 0:01:04I'm just testing how stretchy this thread is.
0:01:04 > 0:01:06It turns out it's very.
0:01:06 > 0:01:07Boing! Ha-ha! Boing!
0:01:07 > 0:01:10BEEPING
0:01:10 > 0:01:14I hear a beep, I see a flash, I wonder what they're going to ask.
0:01:19 > 0:01:22- BOTH: Hi, Nina!- Hi!
0:01:22 > 0:01:25We've got a question for you.
0:01:25 > 0:01:27How does a spider build a web?
0:01:27 > 0:01:31That's a great question! How does a spider build a web?
0:01:31 > 0:01:35Now, spiders' webs are much bigger than the spiders that build them,
0:01:35 > 0:01:37so how do they do it?
0:01:37 > 0:01:40Come down to my workshop and we'll investigate.
0:01:40 > 0:01:43BOTH: See you soon, Nina! Bye!
0:01:43 > 0:01:45Bye!
0:01:45 > 0:01:48Well, I'm going to need some help to answer this one
0:01:48 > 0:01:50and I know just who to ask.
0:01:50 > 0:01:52OK, Neurons, time to get to work.
0:02:08 > 0:02:10ALL: Neurons at the ready, Nina.
0:02:10 > 0:02:15OK, today's question is how does a spider build a web?
0:02:15 > 0:02:19Which Neuron will be most useful in helping us find the answer?
0:02:19 > 0:02:22- Yippee!- It's Bud!
0:02:23 > 0:02:26ALL: Go, Bud! Go, Bud! Go, Bud!
0:02:26 > 0:02:28Go, Bud! Go, Bud! Go, Bud!
0:02:28 > 0:02:30Go, Bud!
0:02:30 > 0:02:33Give me a taste of the action, Nina!
0:02:33 > 0:02:36Today's question is how does a spider build a web?
0:02:36 > 0:02:40Lots of spiders build webs to catch insects to eat,
0:02:40 > 0:02:42so Bud will be helping me today.
0:02:42 > 0:02:46Stand by, Neurons, I've a feeling I may need help from all of you.
0:02:46 > 0:02:50I need to get the workshop ready before the experimenters arrive.
0:02:52 > 0:02:55Hugo loves building things with toys.
0:02:55 > 0:02:58Ugochi likes telling stories.
0:02:58 > 0:03:03They both want to know how does a spider build a web?
0:03:03 > 0:03:09Today, for one day only, Hugo and Ugochi become the experimenters!
0:03:13 > 0:03:16- Hi, guys. - BOTH: Hi, Nina.
0:03:16 > 0:03:19Welcome to my workshop and thank you for your great question,
0:03:19 > 0:03:22how does a spider build a web?
0:03:22 > 0:03:25Well, let's have a look at a spider's web.
0:03:25 > 0:03:28Different spiders build different types of webs.
0:03:28 > 0:03:32Lots of spiders build webs that are shaped like this.
0:03:32 > 0:03:36These long threads look like the spokes of a wheel, don't they?
0:03:36 > 0:03:38Like on a bike.
0:03:38 > 0:03:40Yes, exactly!
0:03:40 > 0:03:45The spokes are joined together by more thread in a spiral.
0:03:45 > 0:03:50- What do you think the web's made of?- Thread.
0:03:50 > 0:03:54Yes, it's made of a special kind of thread called spider silk.
0:03:54 > 0:03:58The spiders make it inside their own body.
0:03:58 > 0:04:00- Isn't that cool?!- BOTH: Yeah!
0:04:00 > 0:04:03Let's see how it starts its web.
0:04:05 > 0:04:09First, the spider spins a long super-strong thread.
0:04:09 > 0:04:14Spiders need a web that's much bigger than they are.
0:04:14 > 0:04:17So then it waits for the wind to blow the thread across
0:04:17 > 0:04:21the big gap because the spider's too small to reach itself,
0:04:21 > 0:04:24so it needs the wind to help it.
0:04:24 > 0:04:28When the thread does catch, the spider pulls it tight
0:04:28 > 0:04:30and walks across it.
0:04:30 > 0:04:32Why don't we build our own spider's web?
0:04:32 > 0:04:34Let's get experimenting.
0:04:34 > 0:04:37ALL: Whoop-whoop! An experiment!
0:04:37 > 0:04:40We're ready, Nina!
0:04:40 > 0:04:45So here our little spider has added some more threads to make the frame.
0:04:45 > 0:04:47- What's missing?- The spokes. - Yes!
0:04:47 > 0:04:50So let's make some spokes.
0:04:50 > 0:04:53You're going to use the knobs to attach the spokes
0:04:53 > 0:04:57but a spider would actually spin a different type of sticky silk
0:04:57 > 0:04:59and put it on like a blob of glue.
0:04:59 > 0:05:02So spiders can make different types of silk, Nina.
0:05:02 > 0:05:03Yes, Belle.
0:05:03 > 0:05:08Some spiders make seven different types of silk to do different jobs.
0:05:08 > 0:05:10OK, let's get these spokes attached.
0:05:10 > 0:05:12- Are you ready?- BOTH: Yeah!
0:05:12 > 0:05:14OK, go for it!
0:05:19 > 0:05:20Very good.
0:05:29 > 0:05:31You're doing really well, guys.
0:05:31 > 0:05:34Just like the spokes of a wheel,
0:05:34 > 0:05:37these threads have helped to strengthen this web
0:05:37 > 0:05:39so it keeps its shape.
0:05:39 > 0:05:41That's the first part of the web.
0:05:41 > 0:05:45So well done, experimenters, and well done, Mr Spider.
0:05:45 > 0:05:49We found out that spiders' webs are made from spider silk.
0:05:49 > 0:05:53Lots of spiders use a super-strong type of silk to build
0:05:53 > 0:05:57- the main structure of the web... - Which looks a bit like a wheel.
0:05:57 > 0:05:59You've got it, Neurons.
0:05:59 > 0:06:04The super-strong silk on the spokes is also a little bit stretchy.
0:06:04 > 0:06:07So let's do an experiment to find out why
0:06:07 > 0:06:11and I think you're going to get a real kick out of this one.
0:06:16 > 0:06:19Hmmm, where do you think we're going today?
0:06:19 > 0:06:22Nina said we would get a kick out of this experiment.
0:06:22 > 0:06:25Maybe it's a karate kick. Hiyah!
0:06:25 > 0:06:27Oh, I do hope not.
0:06:27 > 0:06:31Relax, Felix, we're here and it doesn't look like
0:06:31 > 0:06:33they'll be doing karate.
0:06:33 > 0:06:37So, experimenters, why do you think spiders build webs?
0:06:37 > 0:06:40- To catch flies.- That's right.
0:06:40 > 0:06:45Most spiders build webs to catch flies or other insects to eat.
0:06:45 > 0:06:49Bleurgh! I'm glad you don't eat flies, Nina!
0:06:49 > 0:06:51Me too, Bud!
0:06:51 > 0:06:56We're going to imagine that the net in our goal is like a spider's web
0:06:56 > 0:07:00and these balls are like insects flying into it.
0:07:00 > 0:07:04Let's see what happens when they hit our pretend web.
0:07:08 > 0:07:10Very good!
0:07:10 > 0:07:14Brilliant! Excellent shot. Hugo, your turn.
0:07:14 > 0:07:15Very good!
0:07:15 > 0:07:18Look at those flies go. Zoom!
0:07:23 > 0:07:26Superb work!
0:07:26 > 0:07:30Lots of flies hit our net web but what happened?
0:07:30 > 0:07:33They bounced back.
0:07:33 > 0:07:37They did and that's because the net didn't stretch at all.
0:07:37 > 0:07:41When a fly, that was moving rather quickly, hit the stiff web
0:07:41 > 0:07:45it pinged right back out, well out of the reach of the spider
0:07:45 > 0:07:48and that meant no tasty meal for Mr Spider.
0:07:48 > 0:07:52Let's try that again but this time we'll use a stretchy net,
0:07:52 > 0:07:56like the stretchy silk in a spider's web.
0:07:56 > 0:07:59Do you think the net will be as stretchy as me?
0:07:59 > 0:08:01ALL: Hee-hee-hee!
0:08:05 > 0:08:10Look, the net is stretching when the flies hit it.
0:08:10 > 0:08:13Good. Great throw.
0:08:13 > 0:08:15Excellent!
0:08:20 > 0:08:24- So what happened? - They didn't bounce back as far.
0:08:24 > 0:08:27That's right! Let's have a look at it in slow motion
0:08:27 > 0:08:29to see what happened.
0:08:29 > 0:08:33With the stiff net the flies bounced straight back out
0:08:33 > 0:08:35and the net hardly moved.
0:08:35 > 0:08:38If a real spider's web was like this,
0:08:38 > 0:08:41the insects would bounce off and escape.
0:08:41 > 0:08:45The stretchy net moved much more when the flies hit it
0:08:45 > 0:08:48and a spider's web works in the same way.
0:08:48 > 0:08:51When an insect flies into it really quickly,
0:08:51 > 0:08:54the spokes of the web stretch a bit.
0:08:54 > 0:08:56This helps to slow the insects down.
0:08:56 > 0:09:00The stretchy spokes of a spider's web help to slow insects down
0:09:00 > 0:09:02when they fly into it.
0:09:02 > 0:09:06This means they're less likely to bounce back out and escape.
0:09:06 > 0:09:07That's right, Neurons.
0:09:07 > 0:09:11To stop the insects from escaping, the spider's web needs to
0:09:11 > 0:09:13do something else as well.
0:09:13 > 0:09:16Let's do an experiment to find out.
0:09:18 > 0:09:21Your question was how do spiders build a web?
0:09:21 > 0:09:25So far we've found out that spiders build the frame
0:09:25 > 0:09:29and the spokes of the web first using a strong and stretchy silk.
0:09:29 > 0:09:35Then the spider crawls round and round making a silk spiral
0:09:35 > 0:09:40and this experiment will show us how important that spiral is.
0:09:40 > 0:09:43Now, you guys are in your fantastic costumes
0:09:43 > 0:09:46and they're also going to help us with the experiment.
0:09:46 > 0:09:52Hugo, you're going to be our spider and this is your amazing spider web.
0:09:52 > 0:09:57You are going to be chasing Ugochi, our fantastic fly.
0:09:57 > 0:10:01Now, Ugochi, when an insect lands in a web, the spider feels
0:10:01 > 0:10:04the movement through the silky spokes.
0:10:04 > 0:10:06When you land on this web, Hugo the spider
0:10:06 > 0:10:10will feel that you're there and come and chase you.
0:10:10 > 0:10:12I want you to try and escape.
0:10:12 > 0:10:15Brilliant, I love a game of chase!
0:10:17 > 0:10:19Ready, steady, go!
0:10:26 > 0:10:29- What's happened, little fly? - I'm stuck.
0:10:29 > 0:10:33Stuck?! Here comes spider Hugo.
0:10:33 > 0:10:35Oh, dear! Better help you down.
0:10:37 > 0:10:39What you didn't see was this -
0:10:39 > 0:10:43sticky material on the web.
0:10:43 > 0:10:47So that's why the fly got stuck.
0:10:47 > 0:10:51I'm so glad that spider Hugo didn't eat you for his dinner,
0:10:51 > 0:10:54- aren't you?!- Yes!
0:10:54 > 0:10:58So you couldn't escape because the spiral was sticky
0:10:58 > 0:11:01and that's what happens in a real spider's web.
0:11:01 > 0:11:05When a spider is spinning the silk for the spiral, it covers
0:11:05 > 0:11:08it in another sticky kind of silk.
0:11:08 > 0:11:12When an insect flies into the web, the sticky stuff traps it
0:11:12 > 0:11:14until the spider can reach it.
0:11:14 > 0:11:17Why doesn't the spider get stuck, Nina?
0:11:17 > 0:11:21Well, the clever spider moves around on the spokes of the web
0:11:21 > 0:11:25most of the time because those aren't sticky.
0:11:25 > 0:11:27# Nina and the Neurons. #
0:11:30 > 0:11:33Your question was how does a spider build a web?
0:11:33 > 0:11:36I think we've answered it.
0:11:36 > 0:11:39Spiders build webs using different types of silk.
0:11:39 > 0:11:43They start with a long thread of super-strong silk
0:11:43 > 0:11:46and use the wind to blow it across a gap.
0:11:46 > 0:11:51Next they build a strong frame and stretchy spokes,
0:11:51 > 0:11:53so the insects don't bounce out.
0:11:53 > 0:11:56Then the spider builds a sticky spiral to trap
0:11:56 > 0:11:59insects to eat for its tea.
0:11:59 > 0:12:01Yucky!
0:12:01 > 0:12:03I hope that answered your question.
0:12:03 > 0:12:06Thanks, Nina. Bye!
0:12:06 > 0:12:09You're welcome. Bye!
0:12:10 > 0:12:14If you want to know more about the science that's all around us,
0:12:14 > 0:12:18go to the Nina section on the CBeebies website. Have fun!
0:12:18 > 0:12:21# Super structures Super structures
0:12:21 > 0:12:24# Super structures Super structures
0:12:24 > 0:12:26# Super structures
0:12:26 > 0:12:30# Some of them are tall Some of them are wide
0:12:30 > 0:12:32# They're bumpy, lumpy, wiggly too
0:12:32 > 0:12:34# Wiggly too
0:12:34 > 0:12:37# Some of them are strong Some of them are small
0:12:37 > 0:12:38# Like me
0:12:38 > 0:12:40# They're windy, whirly, whooshy too
0:12:40 > 0:12:44# All around Look over here
0:12:44 > 0:12:48# Build it, stack it, pile it up
0:12:48 > 0:12:50# Come on, let's get building
0:12:50 > 0:12:52- # Building,- building,- building
0:12:52 > 0:12:56# Race it, hold it, make it stick
0:12:56 > 0:13:00# Come on, let's get building
0:13:00 > 0:13:04# Come on, let's get building
0:13:06 > 0:13:09# Some of them are cosy warm Some of them are chilly
0:13:09 > 0:13:12# Keep us safe and hide us too
0:13:12 > 0:13:14# Hide us too
0:13:14 > 0:13:18# Some of them are just for fun Or help us to stay dry
0:13:18 > 0:13:21# They're underground And high up too
0:13:21 > 0:13:24# Look around Over here
0:13:24 > 0:13:27# Build it, stack it, pile it up
0:13:27 > 0:13:30# Come on, let's get building
0:13:30 > 0:13:32- # Building,- building,- building
0:13:32 > 0:13:35# Race it, hold it, make it stick
0:13:35 > 0:13:39# Come on, let's get building
0:13:40 > 0:13:44# Come on, let's get building! #
0:13:44 > 0:13:48And remember there are super structures everywhere.
0:13:48 > 0:13:52Whether they're big or small, wide or tall, we can all get building.
0:13:52 > 0:13:54See you again soon. Bye!
0:13:54 > 0:13:57- ALL: Bye!- Get building!