0:00:05 > 0:00:08# If you've got a question and you don't know where to go
0:00:08 > 0:00:11# Ask Nina for some help Cos she's got a science show
0:00:11 > 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 > 0:00:23- # Eyes.- Eyes! - Ears.- Ears!- 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 > 0:00:35# Ollie sniffs out smells 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 > 0:00:48- # Eyes.- Eyes! - Ears.- Ears!- Nose.- Nose!
0:00:48 > 0:00:50# Nina and the Neurons find out what you need to know
0:00:50 > 0:00:53# Nina and the Neurons find out what you need to know
0:00:53 > 0:00:54# Oh, yeah! #
0:00:56 > 0:00:57Oh, hello.
0:00:57 > 0:01:00I'm just writing myself a little note. Look.
0:01:02 > 0:01:06What do you mean you can't see it? OK, I've lost my normal pen
0:01:06 > 0:01:09so I'm writing in invisible ink.
0:01:09 > 0:01:14It's to remind me to buy a new pen.
0:01:14 > 0:01:17- Ha-ha! - ELECTRONIC BEEPING
0:01:17 > 0:01:21I hear a beep, I see a flash - I wonder what they're going to ask.
0:01:23 > 0:01:25CHILDREN: Hi, Nina!
0:01:25 > 0:01:27Hello there.
0:01:27 > 0:01:30We've got a question for you, Nina.
0:01:30 > 0:01:33How do the stars on our ceiling glow in the dark?
0:01:33 > 0:01:37Great question. How do the stars on our ceilings glow in the dark?
0:01:37 > 0:01:42Could you bring some of your stars to my lab and we'll investigate.
0:01:42 > 0:01:44See you soon, Nina.
0:01:44 > 0:01:46- Bye.- Bye.
0:01:46 > 0:01:50I'm going to need some help to answer this and I know who to ask.
0:01:50 > 0:01:53OK, Neurons, time to get to work.
0:02:05 > 0:02:07ALL: Neurons at the ready, Nina.
0:02:07 > 0:02:09OK. Today's question is,
0:02:09 > 0:02:13how do the stars on our ceilings glow in the dark?
0:02:13 > 0:02:17Which Neuron will be most useful to find the answer?
0:02:17 > 0:02:18ALL: Me! Me! Me!
0:02:18 > 0:02:20Will it be fabulous Felix?
0:02:20 > 0:02:24I can help so very much if you need the sense of touch.
0:02:24 > 0:02:26Will it be beautiful Belle?
0:02:26 > 0:02:31I send messages to brain from ear. If there's a sound, I'll help you hear.
0:02:31 > 0:02:32Will it be lovely Luke?
0:02:32 > 0:02:35For looking and seeing, day or night,
0:02:35 > 0:02:38I'll help you with your sense of sight.
0:02:38 > 0:02:39Will it be awesome Ollie?
0:02:39 > 0:02:42If it's pongy or whiffy but you can't tell,
0:02:42 > 0:02:46- my messages help your sense of smell. - Or will it be baby Bud?
0:02:46 > 0:02:51Sour, salty, bitter or sweet, I'm your taste buddy whenever you eat!
0:02:54 > 0:02:57- It's Luke!- Yes! - CHEERING
0:02:57 > 0:02:59Neurons: # Go Luke, go Luke
0:02:59 > 0:03:01# Go Luke, go Luke
0:03:01 > 0:03:04# Go Luke, go Luke
0:03:04 > 0:03:05# Go Luke. #
0:03:05 > 0:03:08Cool, Nina. I'll be looking out to help you!
0:03:08 > 0:03:09Today's question is,
0:03:09 > 0:03:13how do the stars on our ceilings glow in the dark?
0:03:13 > 0:03:17Now, because we see glow stars glow, Luke will be helping us today.
0:03:17 > 0:03:22I'd better get the lab ready before the Experimenters arrive.
0:03:24 > 0:03:25Razi likes chess.
0:03:25 > 0:03:27Jack loves making puppets.
0:03:27 > 0:03:32Mia's learning Mandarin. They all want to know more about glow stars.
0:03:32 > 0:03:34So, today for one day only,
0:03:34 > 0:03:37Razi, Jack and Mia become the experimenters!
0:03:39 > 0:03:41ALL: Hi, Nina.
0:03:41 > 0:03:43Welcome to my lab. Come in!
0:03:43 > 0:03:45So, your question was,
0:03:45 > 0:03:48how do the stars on our ceilings glow in the dark?
0:03:48 > 0:03:52- So, why do you want to know that? - Because I've got a glow star
0:03:52 > 0:03:56- and I want to know how it glows. - Did you bring some stars?
0:03:56 > 0:03:57ALL: Yes!
0:03:57 > 0:03:59Oh, brilliant!
0:03:59 > 0:04:03For our first experiment, we're going to be using these stars
0:04:03 > 0:04:05and our senses.
0:04:05 > 0:04:09ALL: Whoop-whoo! A senses experiment! We're ready, Nina!
0:04:09 > 0:04:12First, we'll dim the lights to make it darker
0:04:12 > 0:04:15so we can see what the glow stars do.
0:04:17 > 0:04:20Look! They're shining brightly, aren't they?
0:04:20 > 0:04:22- ALL: Yeah. - As you can see,
0:04:22 > 0:04:24I've got my own glow stars.
0:04:24 > 0:04:26I've got some there.
0:04:26 > 0:04:30They look like they're shining in the dark.
0:04:30 > 0:04:35Yeah. When something glows brightly, it gives off light, doesn't it?
0:04:35 > 0:04:36- Yeah.- Yeah.
0:04:36 > 0:04:39Let me put the lights back up.
0:04:39 > 0:04:43OK. Let's look at some other things that give off light.
0:04:43 > 0:04:47Like my lamp! I'll just turn it on.
0:04:47 > 0:04:51- Oh, it's not working. - You haven't plugged it in!
0:04:51 > 0:04:56Oh, let's have a look. Oh! You're right, I haven't!
0:04:56 > 0:04:59This light needs electricity to work. I'll do this -
0:04:59 > 0:05:02plugs and sockets can be dangerous.
0:05:05 > 0:05:07Hooray!
0:05:07 > 0:05:10Now we've plugged the lamp in, the light is glowing.
0:05:10 > 0:05:14Hee-hee! Oh, and here's a torch.
0:05:14 > 0:05:18It doesn't have a plug but it still lights up. Look.
0:05:18 > 0:05:20Hey!
0:05:20 > 0:05:23That's because of these.
0:05:23 > 0:05:26- Do you know what these are? - Batteries.
0:05:26 > 0:05:30That's right, batteries. These aren't for playing with either.
0:05:30 > 0:05:33To give a light, we had to plug in the lamp
0:05:33 > 0:05:36and use batteries for the torch.
0:05:36 > 0:05:38But the stars weren't plugged in
0:05:38 > 0:05:41and I don't think they had batteries.
0:05:41 > 0:05:45So how did they glow? We need to do another experiment.
0:05:45 > 0:05:47Let's go this way!
0:05:49 > 0:05:54Let's keep our eyes safe and put on our safety goggles.
0:05:54 > 0:05:59And as I'll be using chemicals, I'll wear my safety gloves, too.
0:06:01 > 0:06:04Mixing chemicals can only be done in Nina's lab.
0:06:04 > 0:06:07You should never mix things yourself.
0:06:07 > 0:06:11OK. In these beakers are some very special chemicals.
0:06:11 > 0:06:13They don't look very special right now,
0:06:13 > 0:06:15but I'm going to mix them up.
0:06:17 > 0:06:19I'll dim the lights.
0:06:23 > 0:06:25Watch this.
0:06:28 > 0:06:29Wow.
0:06:29 > 0:06:31ALL: Ooh!
0:06:31 > 0:06:33Now I'll do the next one.
0:06:36 > 0:06:39ALL: Ooh!
0:06:39 > 0:06:43- And now the last one. - I hope it'll be red.- Let's see.
0:06:45 > 0:06:47- OH! What colour is it?- It's green!
0:06:47 > 0:06:54Yeah! Oh, fantastic! Sometimes when we mix different chemicals,
0:06:54 > 0:06:58they give off a glowing light and this is called luminescence.
0:06:58 > 0:07:03Lumin... Lumin... That's a difficult word to say, Nina!
0:07:03 > 0:07:07But luminescence is really useful -
0:07:07 > 0:07:11it means we can make light without electricity or batteries.
0:07:11 > 0:07:16Hm. But we didn't mix chemicals to make the glow stars glow, did we?
0:07:16 > 0:07:19No, Nina. They glowed all by themselves.
0:07:19 > 0:07:22It certainly looked like that.
0:07:22 > 0:07:25I know something else that glows in the dark
0:07:25 > 0:07:29that might help us solve this mystery. Shall we see it?
0:07:29 > 0:07:32- ALL: Yeah. - Brilliant. Goggles off.
0:07:35 > 0:07:39I love this bit. I wonder where Nina is taking us.
0:07:39 > 0:07:43Nina said we would see something that glows in the dark.
0:07:43 > 0:07:47But I don't know how. It's not even dark outside!
0:07:47 > 0:07:54Well, we're here! I can't see anything glowing at all.
0:07:54 > 0:07:58Wow! Look at the size of that dinosaur!
0:07:58 > 0:08:01I hope it's not hungry!
0:08:01 > 0:08:05Don't worry. I don't think it finds taste buds very tasty.
0:08:05 > 0:08:09- Hi, Nina. I've been expecting you. - Hi, Jo. Thanks very much
0:08:09 > 0:08:11for inviting us to the museum.
0:08:11 > 0:08:14The things we've come to see are inside this room!
0:08:14 > 0:08:16Prepare to be amazed!
0:08:20 > 0:08:22Hoo-hoo-hoo!
0:08:22 > 0:08:27So, guys, this is what we've come to see. Some very special rocks.
0:08:27 > 0:08:32Well, they don't look very special to me. They just look like...
0:08:32 > 0:08:33- Rocks.- Exactly.
0:08:33 > 0:08:38They may look like ordinary rocks now, but when we dim the lights,
0:08:38 > 0:08:40something very special happens.
0:08:42 > 0:08:43Oh.
0:08:43 > 0:08:48Er, am I missing something here? I can't see anything!
0:08:48 > 0:08:53Ha-ha! I think we're all completely in the dark, Bud! Especially Nina!
0:08:53 > 0:08:58Ohh! I forgot to switch on my special torch.
0:08:58 > 0:08:59Here we go.
0:08:59 > 0:09:02(Wow!)
0:09:02 > 0:09:04Wow. Look at that!
0:09:04 > 0:09:10- Can you see what's happening?- The rocks are going different colours.
0:09:10 > 0:09:14The rocks glow because of the special light shining on them
0:09:14 > 0:09:15that makes them glow.
0:09:15 > 0:09:18It's called ultra-violet light.
0:09:18 > 0:09:21It's coming from this special torch.
0:09:21 > 0:09:25Ooh. Jo, can we have the normal lights back on now, please?
0:09:28 > 0:09:32- The rocks have stopped glowing, Nina.- That's because I turned off
0:09:32 > 0:09:34the special torch.
0:09:34 > 0:09:38- But our glow stars keep glowing for AGES, Nina.- They do.
0:09:38 > 0:09:42We need to go back to the lab for one final experiment.
0:09:42 > 0:09:43ALL: Yeah!
0:09:46 > 0:09:51Your question was, how do the stars on our ceilings glow in the dark?
0:09:51 > 0:09:55The rocks glowed when ultra-violet light shone on them.
0:09:55 > 0:09:58Could ultra-violet light be making our stars glow?
0:09:58 > 0:10:02We need to do an experiment to find out.
0:10:02 > 0:10:05Each of these envelopes contains a glow star.
0:10:05 > 0:10:07They've had no light shone on them,
0:10:07 > 0:10:11they've been kept in the dark. Do you think they'll glow?
0:10:11 > 0:10:13ALL: Yes!
0:10:16 > 0:10:21- Take out your glow stars. Let's see if they glow. Is it glowing?- No.
0:10:21 > 0:10:24- There's no light coming from it. - You're right.
0:10:24 > 0:10:28you guys have proved that glow stars do not glow
0:10:28 > 0:10:31if they're kept in the dark. Well done.
0:10:31 > 0:10:33Pop the stars back in the envelopes.
0:10:33 > 0:10:36Lights up.
0:10:36 > 0:10:42Next, when we take the stars out, we'll place them under the lights.
0:10:42 > 0:10:45Jack, you have the ultra-violet torch.
0:10:45 > 0:10:50Mia, you've got a normal torch and Razi, you have a normal lamp.
0:10:50 > 0:10:56OK, switch your lights on and I'll dim the lights.
0:10:56 > 0:11:02OK. Take the stars out and place them in the light in front of you.
0:11:02 > 0:11:05We'll leave them for about five minutes.
0:11:07 > 0:11:11Right, let's see if the glow stars are glowing!
0:11:11 > 0:11:16Jack, can you turn your ultra-violet torch off, please?
0:11:18 > 0:11:19Look at your star.
0:11:19 > 0:11:22- It's still glowing.- That's because
0:11:22 > 0:11:26your torch gives out ONLY ultra-violet light.
0:11:26 > 0:11:29Glow stars need that to make them glow,
0:11:29 > 0:11:33just like the rocks in the museum. But with glow stars,
0:11:33 > 0:11:38they keep on glowing, even when the ultra-violet light has stopped.
0:11:38 > 0:11:42So turn your lights off, please, and let's look at your stars.
0:11:42 > 0:11:45- Are they glowing? - Yes.- Yeah.- They are,
0:11:45 > 0:11:50but not as much as Jack's star.
0:11:50 > 0:11:55Mia, your torch and Razi, your lamp, have normal light bulbs.
0:11:55 > 0:11:58Even normal bulbs give a little ultra-violet light
0:11:58 > 0:12:02and that's enough to make the stars glow.
0:12:04 > 0:12:08Your question was, how do the stars on our ceilings glow in the dark?
0:12:08 > 0:12:12I think we've answered it. Glow stars glow
0:12:12 > 0:12:17because of ultra-violet light. There's a bit in ordinary bulbs
0:12:17 > 0:12:19and lots of it in sunlight.
0:12:19 > 0:12:22so when the sunlight shines in your window
0:12:22 > 0:12:26or the lights from your bedroom shine on your glow stars,
0:12:26 > 0:12:29they start to glow. When you turn the light off,
0:12:29 > 0:12:32the glow stars keep on glowing.
0:12:32 > 0:12:34But it doesn't last forever.
0:12:34 > 0:12:37The glow fades when the stars are kept in the dark.
0:12:37 > 0:12:42- I hope that answered your question. - ALL: Thanks, Nina. Bye!
0:12:42 > 0:12:43Bye.
0:12:46 > 0:12:49If you want to know more about the science all around us,
0:12:49 > 0:12:54go to the Nina section on the CBeebies website. Have fun!
0:12:54 > 0:12:55Lab coat on, Nina?
0:12:55 > 0:12:57Lab coat on, Ollie.
0:12:57 > 0:12:58Safety gloves on, Nina?
0:12:58 > 0:13:00Safety gloves on, Felix.
0:13:00 > 0:13:03Don't forget your goggles, Nina.
0:13:03 > 0:13:06Goggles are on, Luke. I think we're ready!
0:13:08 > 0:13:10# We do experiments in the lab
0:13:10 > 0:13:14- # In the lab! - Shooby-dooby, in the lab
0:13:14 > 0:13:16# Bubbling experiments in the lab
0:13:16 > 0:13:17# In the lab!
0:13:17 > 0:13:20# Go, Nina, in the lab
0:13:20 > 0:13:23# Fizzing and popping Steam and smoke
0:13:23 > 0:13:25# We need protection Don't we, folks?
0:13:25 > 0:13:30# We always put our safety first
0:13:30 > 0:13:32# Shooby-dooby, dooby-dooby
0:13:32 > 0:13:34# We do experiments in the lab
0:13:34 > 0:13:35# In the lab!
0:13:35 > 0:13:36# Go, Nina! #
0:13:36 > 0:13:38It's been a marvellous day.
0:13:38 > 0:13:42The glow stars glowed without plugs or batteries.
0:13:42 > 0:13:44I really enjoyed myself today,
0:13:44 > 0:13:48especially when Nina mixed the chemicals.
0:13:48 > 0:13:51Ahh, it's been such a great day, man!
0:13:51 > 0:13:55Seeing those rocks glow under the ultra-violet light.
0:13:55 > 0:13:58I've had a fabby day!
0:13:58 > 0:14:02Finding out how the glow stars glow was BRILLIANT!
0:14:02 > 0:14:05Our day's been bursting with experiments.
0:14:05 > 0:14:08I hope you enjoyed it. See you soon. Bye!
0:14:08 > 0:14:11ALL: Bye!
0:14:11 > 0:14:13E-mail subtitling@bbc.co.uk