0:00:02 > 0:00:04BELL RINGS
0:00:04 > 0:00:0630 seconds to air, everyone.
0:00:06 > 0:00:09Professor, why do you keep buying all that old rubbish?
0:00:09 > 0:00:11What do you mean, Dr Knowles?
0:00:11 > 0:00:15A yellow rubber duckie, half a roller-skate, giant underpants...
0:00:16 > 0:00:19It is hardly what you would call rubbish.
0:00:19 > 0:00:20RIP!
0:00:20 > 0:00:21Uh-oh!
0:00:21 > 0:00:23Wa-a-ah!
0:00:23 > 0:00:24Oh, crumpets!
0:00:24 > 0:00:26BELL RINGS Positions!
0:00:26 > 0:00:28Ms Hucklebuck!
0:00:28 > 0:00:31This is Brain Freeze, with...
0:00:42 > 0:00:43Stand by!
0:00:43 > 0:00:45Come on, everybody!
0:00:48 > 0:00:50It is time for...
0:00:53 > 0:00:54Today's question is...
0:00:56 > 0:00:58There are three types of tears.
0:00:58 > 0:01:01Basal tears flow continuously throughout the day
0:01:01 > 0:01:03to keep our eyes from drying out.
0:01:03 > 0:01:07Reflex tears occur in response to irritants like dust or onions,
0:01:07 > 0:01:10and emotional tears occur in response to sadness,
0:01:10 > 0:01:13happiness or physical pain.
0:01:16 > 0:01:17Aaah!
0:01:17 > 0:01:20HE SOBS
0:01:21 > 0:01:24Tears are produced mostly by the lacrimal glands,
0:01:24 > 0:01:27located just above the outer corner of each eye.
0:01:27 > 0:01:31They are usually swallowed or become part of the nasal fluid.
0:01:31 > 0:01:33Which is why we get a runny nose when we cry.
0:01:33 > 0:01:36Any excess tears spill from the lower eyelids
0:01:36 > 0:01:38in what we know as crying.
0:01:38 > 0:01:43On average, we produce over 110 litres of tears every year.
0:01:43 > 0:01:45110 litres?
0:01:45 > 0:01:47Unbelievable.
0:01:47 > 0:01:49See you after this break.
0:01:50 > 0:01:51And we are clear!
0:01:53 > 0:01:56Oh, you poor thing. Let it all out.
0:01:56 > 0:02:00We had such good times together, me and Trampolina.
0:02:00 > 0:02:02Bouncing at the Open,
0:02:02 > 0:02:06the tumble in the jungle, the prance in France.
0:02:06 > 0:02:10Now we will never bounce together again!
0:02:10 > 0:02:12Maybe an inflatable duckie will cheer you up.
0:02:12 > 0:02:14Not now, McCork.
0:02:14 > 0:02:18- How about half a roller-skate? - Stop it, leave her be.
0:02:18 > 0:02:22Hang on a minute, can I see that box of junk again, Professor?
0:02:22 > 0:02:25- I have an idea. - An idea? Oh, I love them things.
0:02:25 > 0:02:28BELL RINGS Places, everybody!
0:02:33 > 0:02:36So, tell us, Dr Knowles, why do we cry?
0:02:36 > 0:02:38Emotional crying is unique to human beings.
0:02:38 > 0:02:42It is thought to be a non-verbal way to communicate needs
0:02:42 > 0:02:45and to let others know when we are in distress.
0:02:45 > 0:02:48By letting other people know when we need help,
0:02:48 > 0:02:50we increase our chances of survival.
0:02:50 > 0:02:53So, is crying good for us?
0:02:53 > 0:02:54Just like laughing,
0:02:54 > 0:02:58crying is a critical part of human emotional make-up.
0:02:58 > 0:03:01Studies have shown that most people feel better after a good cry.
0:03:04 > 0:03:06Oh, phew. Yay!
0:03:09 > 0:03:12So it's probably something we should all do now and again.
0:03:12 > 0:03:14Did you hear that, Ms Hucklebuck?
0:03:14 > 0:03:16MS HUCKLEBUCK SOBS
0:03:16 > 0:03:18See you next time, everyone.
0:03:21 > 0:03:24Hang on, I've nearly got it.
0:03:24 > 0:03:25Really, Dr Knowles,
0:03:25 > 0:03:29this is the kind of bonkers idea I would come up with.
0:03:29 > 0:03:31Well, it's our only shot.
0:03:31 > 0:03:33THEY GROAN
0:03:33 > 0:03:36Whoa! That's it.
0:03:36 > 0:03:39Nice job, Dr Knowles. That actually looks pretty good.
0:03:39 > 0:03:42Ha-ha! Woo-hoo!
0:03:44 > 0:03:46Oh, hooray for you, McCork,
0:03:46 > 0:03:49and hooray for your gigantic pants!
0:03:49 > 0:03:52Now, there's a sentence I thought I would never hear.
0:03:52 > 0:03:55Oh, what, the underpants get the credit?
0:03:55 > 0:03:57Why do I bother?