Hello. This is 6 Minute English
 from BBC Learning English.
 I'm Sam.
 And I'm Neil.
 Have you heard this joke, Neil?
 Question: what's a rat's
 favourite game?
 I don't know, Sam, what is a
 rat's favourite game?
 Hide and squeak!
 Ha-ha-ha! Very funny!
 Well, I'm glad you're laughing
 because, as we'll be finding out
 in this programme, laughter is
 good for you! In fact, laughter
 is often called
 'the best medicine'.
 And it seems that's really true,
 medically speaking. Laughing
 releases anti-stress endorphins
 into the body and there's
 evidence that people who laugh
 recover more quickly from
 illness, including Covid.
 Laughing is an essential part
 of what makes us human.
 Babies cry straight from
 birth but the next sound
 they make, often as young
 as two or three months,
 is laughter.
 And who can hear a baby
 laugh without laughing
 themselves? Laughter
 is catching.
 But before we start tickling
 our funny bones, I have
 a quiz question for you,
 Neil, and it's no laughing
 matter. Laughter can be a
 serious business. In fact,
 there's a scientific field
 of study into laughter and
 its effects on the
 human body. But what is this
 study called? Is it:
 a) gigglology? b) gelotology?
 or c) guffology?
 Did you make those words up,
 Sam? They sound a bit funny
 to me! I'll say the study
 of laughter is
 called b) gelotology.
 OK, Neil, but you'll be
 laughing on the other side
 of your face if you're wrong!
 Anyway, we'll find out the
 correct answer later
 in the programme.
 Someone who's an expert
 in the study of laughing -
 whatever it's called - is
 cognitive neuroscientist,
 Professor Sophie Scott.
 Here she explains to
 David Edmonds, presenter
 of BBC World Service
 programme, The Big Idea,
 exactly how a laugh
 is produced.
 Laughing is a variation
 of breathing. Like
 breathing, it involves
 the rib cage.
 When you laugh you get
 these very, very large,
 very fast contractions of
 the rib cage. And it's a
 very primitive way of
 making a sound, so
 you're really just
 squeezing air out in
 big bouts. Each of
 those individual
 squeezes gives you
 a 'ha!' sound.
 The 'ha-ha' sound
 you make when you
 laugh comes from
 your rib cage - a
 structure made of bones,
 called ribs, inside your
 chest which protects
 the heart and lungs.
 The rib cage works like
 a drum to amplify a laugh.
 It's the reason why
 jokes are sometimes
 called 'rib-ticklers'.
 Professor Scott calls
 this a very primitive
 way of making sounds
 because it's simple,
 natural and
 essentially human.
 The word primitive can
 be used to describe
 anything relating to
 the basic way humans
 lived in their early
 stages of development,
 before money, machines
 or writing were invented.
 Primitive human noises,
 like crying and laughing,
 link to a universal human
 experience, and this can
 be seen in the large
 number of words we use
 to talk about them.
 In English, 'chuckle',
 'giggle', 'chortle',
 'cackle' and 'guffaw'
 all describe different
 types of laughter.
 Right, so how would
 you describe a
 'giggle', Sam?
 I'd say a giggle is
 laughing in a quiet but
 uncontrolled way, like a
 child who finds something
 very funny or
 feels embarrassed.
 Unlike a guffaw which
 is when you blast out
 a very loud laugh, often
 at something stupid or
 rude someone has said.
 But humans aren't
 the only animals to
 laugh. We belong to
 the same family as
 other primates like
 chimpanzees, gorillas
 and orangutans, all
 of whom laugh.
 Even rats tickle each
 other and make squeaky
 noises like laughter when
 they play. Here's
 Professor Scott again
 to take up the story for
 BBC World Service programme,
 The Big Idea.
 Play is a very important
 behaviour for mammals - all
 mammals play when they're
 juveniles and some mammals
 play their whole lives,
 and laughter is a sort
 of an invitation to play,
 it s a sign that
 you re playing.
 Professor Scott says
 that laughter is an
 important social tool
 for all mammals - animals,
 including humans, dogs
 and whales, which give
 birth to live young,
 rather than laying
 eggs, and who feed
 their young with milk.
 By laughing, young
 mammals - sometimes
 called juveniles - signal
 that they want to play,
 and young rats who don't
 laugh back are more
 likely to get a bite
 than a giggle. And a
 rat bite is nothing
 to laugh about.
 What a lot of facts
 we've learned about
 laughter, Neil!
 Yes, we could almost
 be experts on
 laughter... 'Guffologists',
 isn't that what you
 called them, Sam?
 Ah yes, in my quiz
 question I asked you
 to name the scientific
 study of laughter and
 its effects on the body.
 I'm almost certain it's
 not 'gigglology' or
 'guffology'! So, the
 answer must be...
 Gelotology! The
 correct answer!
 Well done, Neil, I knew
 you were good for a laugh!
 OK. Let's recap the
 vocabulary from the
 programme before you
 think up any more terrible
 jokes! First, we had
 rib cage - the structure in
 your chest which is made
 of ribs, and produces the
 sound of a laugh.
 The adjective primitive
 relates to the simple,
 natural way humans lived
 in their early
 stages of development.
 There are different types
 of laughter, including
 giggles - childlike laughter
 in a quiet but uncontrolled way.
 And guffaw is when you
 laugh out loud, often at
 something someone has said.
 Mammals are animals,
 including humans, which
 give birth to live young
 and feed them with milk.
 And finally, a young animal
 which is not fully grown
 can be called a juvenile.
 Well, it's been a laugh
 a minute, Sam, but
 unfortunately our six
 minutes are up.
 Join us again soon for
 more trending topics,
 useful vocabulary, and,
 who knows, maybe some
 terrible jokes, here at
 6 Minute English.
 Bye for now!
 Goodbye!