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00:30Thank you very much.
00:34Hello and welcome to Think of a Number.
00:38You there.
00:39Think of a number between 1 and 10.
00:417.
00:417.
00:42Correct.
00:44In this programme, I'm Johnny Baller certainly,
00:46and in this programme we hope to show you how to flex your flexions,
00:49pop your pop-ups,
00:50and even how to double your money.
00:52And I don't mean just fold your pound notes in half.
00:55Also, we'll be exploring the amazing world of numbers.
01:00I think one of the most amazing things about numbers
01:02is the way people seem to be fascinated just by a few numbers.
01:07For instance, before we started the programme,
01:09we played a game of bingo with our studio audience.
01:14So, it's the first person with five numbers on their card.
01:19Eyes down, look in.
01:21All the twos, two little ducks.
01:2422.
01:26Downing Street, number 10.
01:29All the eights, two fat ladies.
01:3388.
01:35Oh, there's a lot of numbers coming out.
01:37On look at the sun, 1 and 3, 13.
01:42Sherwood Forest, all the trees.
01:4533.
01:48On its own, knock at the door.
01:51It's number 4.
01:535 and 2, 52.
01:58Yeah!
02:02Everyone a winner!
02:03Congratulations, because you've won the star prize.
02:05You've all won a free walk to Penzance.
02:09Now, it was a swizz, of course it was,
02:11but it was just to show how fascinating people can be with numbers.
02:14You're all saying, here's another, I've got another,
02:16I've got another, there's only a few numbers.
02:17The fascinating thing about numbers is,
02:20or the amazing thing about numbers is that we're surrounded by them,
02:23yet we're still fascinated by them.
02:25I think we couldn't, we couldn't do without them, you know.
02:28Just imagine what the world would be like without numbers.
02:32Can you imagine what the 9 o'clock news would be like without numbers?
02:40Good evening, and here's the news for when the long hand is pointing straight up
02:43and the short hand is pointing straight across.
02:45Today, the Prime Minister issued a statement from his home in Downing Street.
02:50It's up a bit on the right.
02:52He said that from next week,
02:53the price of butter will go up by several pence a lump,
02:56sweets will go up by a few pence a handful,
02:58and petrol will go up by ever such a lot.
03:01A lady in Edinburgh today gave birth to some babies.
03:05Now, although it's common for a lady to give birth to a baby and another one,
03:08and one often hears stories of ladies giving birth to a baby and another one and another one,
03:14and another one, and another one, and another one, and another one, and another one.
03:21Football.
03:22Oh, just a moment.
03:24Hello?
03:25Yes, fine.
03:27And another one.
03:30Football, here are some late results.
03:32Arsenal, no goals.
03:34Leeds United, some goals.
03:35Aston Villa, some goals.
03:38Liverpool, some more goals.
03:40Manchester United, a lot of goals.
03:42Newcastle United, not quite so many goals.
03:45Oh, thank you.
03:46Here's a flash.
03:47We've just heard that the high jumper, Ivor Springyleg,
03:50has broken the world record high jump by jumping...
03:54that high.
03:56The previous world record was that high, so he's beaten it by that much.
04:01And that's all from the news desk.
04:07So you see...
04:09Oh, thank you.
04:15So you see, we're surrounded by numbers, and we can't live without them.
04:21The thing is...
04:22The other thing is that numbers are so simple to understand.
04:25When you think that all numbers are made up of just ten digits.
04:28One, two, three, four, five, six, seven, eight, nine, and nought.
04:32And the man who thought of this system, whoever he was,
04:35we don't know who he was,
04:36we only know that he had ten fingers.
04:38One, two, three, four, five, six, seven, eight, nine, ten.
04:42And he devised this system so that he could count on his fingers.
04:46And today we can count on our fingers,
04:48unless, of course, we're wearing boxing gloves.
04:50Or unless we have a pocket calculator.
04:54Because today we have pocket calculators to make arithmetic simpler.
04:57For instance, can somebody give me two numbers between one and ten?
05:01Seven and nine.
05:02Seven and nine.
05:04Fine.
05:04So if we want to multiply seven and nine on a pocket calculator,
05:08you simply go, seven times nine equals...
05:12Just get it out.
05:16347.
05:16You see, that's the trouble with a pocket calculator.
05:19Once you put it in your pocket, it's useless.
05:21That's why today we have, in the studio, over here,
05:25in this cupboard, a pocket calculator designed.
05:28Oh!
05:28So that it won't fit in a pocket.
05:36You see?
05:37And we switch it on with the switch there.
05:38And we don't have to count on our fingers.
05:42With a seven...
05:43Multiplying a seven times a nine,
05:45we simply punch it up on the calculator.
05:47Seven times nine.
05:49And the little man inside counts up on his fingers.
05:52And we get...
05:53Equals 63.
05:54You're working well, George.
05:58Of course, it's not really a little man inside.
06:00It couldn't be.
06:01It's quite a big man.
06:04Now, actually, the working brain of a calculator,
06:08this one here and this little one here,
06:11is about that big.
06:12That's called a chip.
06:14It costs about 50p to make, that's all.
06:16And that's the brain that makes calculators work.
06:20However, if George gets his fingers tangled up,
06:23or his batteries go flat,
06:25or his chips go cold,
06:26we have over here...
06:30This is the one.
06:32A show of hands.
06:37There we are.
06:38We always keep these handy.
06:41They're quite armless.
06:43Hey!
06:44Do you know where a general keeps his armies?
06:46Up his sleeve is.
06:48Thank you very much.
06:49Now, did you know that you can make...
06:51do multiplication sums on your fingers?
06:53For instance, if you want to multiply 7 by 9,
06:56you imagine each hand has got numbers on the fingers.
07:00Hold your hands in front of you,
07:02and just think that the little finger has got a 6 on it,
07:05then a 7, 8, 9, to the thumb, which has a 10.
07:09Right?
07:10And you want to multiply 7 by 9.
07:12Well, you make a 7 finger touch a 9 finger.
07:15All right?
07:17We've got a line to show that they're on a line.
07:19You count those two fingers and all those below.
07:22So it's 1, 2, 3, 4, 5, 6.
07:25And you write the 6 down.
07:26Then, you count all the fingers above those touching,
07:34but you count them on each side.
07:36There's 1 on that side,
07:37and 1, 2, 3 on this side.
07:39And you multiply those two numbers together.
07:411 times 3 equals...
07:433.
07:43And the answer is 63,
07:48which is the same answer we've got there.
07:50Now, this only works with numbers between 6 and 10,
07:54quite small numbers.
07:56And people are usually happier with small numbers.
07:58It's amazing how quickly one can get into very large numbers.
08:04We have here a calendar.
08:06It's February.
08:07You can tell it's February because there are 28 days.
08:10Do you know how many months I've got 30 days?
08:15Everyone.
08:1611.
08:17Correct.
08:1811 months I've got 30 days.
08:20You've got to get up early if you want to get out of bed.
08:22Now then.
08:23On the 6th of February,
08:25my doctor told me to take regular exercise for seven days running.
08:29And then to skip a week.
08:33Now, the reason we've got this calendar
08:35is because we heard a story of a boy
08:37whose school are going on an outing to the Silver Jubilee in June.
08:41And he thought,
08:42I'd better save up my money.
08:43If I saved a penny a day,
08:45I might have enough.
08:46So he counted the days
08:47and found it was 128 days
08:49till the outing in June.
08:51So that would only be,
08:52how much?
08:53£1.28.
08:54Right.
08:55Wouldn't be enough.
08:56He'd need a fiver at least.
08:58So he went to his dad.
08:59Now, his dad worked on an airline.
09:01He didn't work at an airport.
09:02He worked at a garage.
09:03And when a car came in with a flat tyre,
09:05he got the airline
09:05and put it out.
09:08So he knew all about inflation.
09:11And so did the boy.
09:12Because he said,
09:12Dad, would you give me a penny today,
09:14being the 1st of February,
09:15and top pence the next day,
09:16and four pence the next day,
09:18and eight pence the next day,
09:19and so on,
09:20so that I can save up for the Jubilee?
09:23And his father thought,
09:24it seems a good system.
09:26He said,
09:26all right,
09:27I'll do it,
09:27but I will only do it
09:28to the end of February.
09:30That's 28 days.
09:32And the boy was a bit worried.
09:33He thought,
09:33oh,
09:33I don't know if I'll have enough.
09:35Do you think he would have enough
09:36in 28 days?
09:36Yes.
09:37Do you think he'd have more?
09:39Yes.
09:39A lot more.
09:40Well, we'll just see.
09:41On the 1st day,
09:42his father would have to give him a penny,
09:43then top pence,
09:44then four pence,
09:45then eight pence,
09:46then 16 pence.
09:47He's not doing bad,
09:48is he?
09:49On the 6th,
09:50he'd get 32 pence,
09:5164 pence,
09:52128 pence,
09:54256 pence,
09:55512 pence.
09:58But it's only the 10th of February.
10:00And 512 pence,
10:01it's 5 pounds,
10:0212 pence,
10:03on that day alone.
10:04And his father would already have given him
10:05another 5 pounds
10:07from the other days.
10:08So he's got 10 pounds.
10:09The next day,
10:10another 10 pounds,
10:12then 20 pounds,
10:13then 40 pounds,
10:1480 pounds,
10:15160 pounds,
10:16310 pounds,
10:17640 pounds,
10:18until by the 28th of February,
10:19his father would have to give him,
10:21on that day alone,
10:22two and a half million pounds.
10:25And he would already have given him
10:27another 2 and a half million pounds
10:29in bits from the other days.
10:31And his father could think himself,
10:33look,
10:33it wasn't a leap year,
10:34because on the next day,
10:35the 29th,
10:35he'd have to give him another
10:365 million pounds.
10:38And if they carried on that system,
10:40for the 128 days,
10:42up to the outing,
10:43the silver jubilee,
10:44his father would have to give him
10:45all these pounds.
10:47and 27p.
10:59Now let's face it,
11:00if you had all that money to save,
11:02you wouldn't need to save,
11:03would you?
11:04From something with a lot of numbers,
11:06now to something with a lot
11:07of letters.
11:09I'm not the regular grave digger,
11:23I'm not the regular grave digger,
11:37I'm just filling in for somebody else.
11:39This is a replica
11:43of the Monmouth tombstone
11:45to be found in the churchyard
11:47of St. Mary the Virgin,
11:48Monmouth, South Wales.
11:51Covered in letters, you see.
11:53All looks gibberish, doesn't it?
11:55Unless you know how to read it.
11:57For instance,
11:57if you start with a H in the middle
11:58and read across,
12:00it says,
12:01here lies
12:02John Rennie.
12:05Starting from the middle
12:06and reading down,
12:07it also says,
12:08here lies
12:09John Rennie.
12:11If you read up from the middle,
12:12it says,
12:13here lies
12:14whichever way you go.
12:16John Rennie.
12:17If you read across from the middle,
12:19it says,
12:19here lies
12:20backwards.
12:21John Rennie
12:22upside down.
12:24In fact,
12:25it doesn't matter
12:25which way you go.
12:26If you start at the middle
12:27and head for one of the corners,
12:28even if you zigzag,
12:30it says,
12:30here
12:31lies
12:33John
12:35Rennie.
12:37How many ways
12:40do you think it spells
12:41here lies
12:42John Rennie?
12:43Any guesses?
12:45The answer is
12:4645,760 ways
12:50of saying
12:51here lies
12:52John Rennie.
12:54And that's not all lies.
12:56That's a grave fact.
12:57Thank you very much.
13:20Thank you very much.
13:23Any more tickets?
13:24We've got one.
13:25Lovely.
13:26Any more?
13:27There we are.
13:27We've all got tickets.
13:29We've all got tickets.
13:30Yes,
13:30that was quick.
13:31I'm a lightning conductor.
13:34Right-o.
13:35Now,
13:35I don't need a hat.
13:37Have you ever been on a bus
13:38and had a ticket
13:40and started doodling?
13:42Yes.
13:43It's best to doodle
13:44with a long ticket.
13:45You can make an endless ticket.
13:46Do you know how to make
13:47an endless bus ticket?
13:49Just fasten the two ends up
13:50and you've got a hoop.
13:52You have a lot of fun
13:52with a couple of hoops.
13:53Sort of hoop, hoop, hooray!
13:56We gave some hoops
13:58to the people on the back row
13:59before we started.
14:00We've all got a couple of hoopsies.
14:01Could you all throw them to me, please?
14:03Ready?
14:03One, two, three, throw!
14:08Hoops.
14:10Now,
14:11some people over here
14:12have got hoops.
14:13Could you throw yours?
14:14One, two, three, throw!
14:16Hey!
14:17There's one!
14:17Oh!
14:18Look at one.
14:20Smashing.
14:21See, all you need
14:21is two hoops
14:22and a drinking straw
14:23and you can make a glider.
14:25Let's get this one as well.
14:27You make a glider
14:27that has got the advantage
14:30of flying straight,
14:32I think.
14:33Well, nearly straight.
14:35Thank you very much.
14:40Get the hoops now.
14:42You've got your strip of ticket.
14:43Now,
14:44can anyone make
14:46a five-sided flat figure
14:48with a piece of ticket?
14:50A pentagon.
14:51A five-sided flat figure.
14:54Have a try.
14:55It's very difficult
14:55if you don't know how to do it.
14:57But if you know how to do it,
14:58it's easy.
14:59And I know how to do it
15:00because I read it in a book.
15:02So I've wangled it.
15:03Anybody?
15:04Let me show you.
15:05All you do
15:05is just tie it in a knot.
15:09Right over there.
15:12Pull the end through.
15:13And you have to do it gently
15:14and then squash it flat, slowly.
15:17And you find
15:20on a good day
15:22that you make
15:24a pentagon.
15:25Not a polygon.
15:26That's a dead parrot.
15:29Pentagon.
15:31Five-sided.
15:32That's right.
15:32And if you fold
15:34one other side
15:35round the back
15:36and hold it up
15:37to a strong light,
15:40you see something else?
15:42We've got one
15:43just over here.
15:45Have a look.
15:46There we are.
15:53There we are.
15:55There's your pentagon.
15:57Looking through it,
15:58you can see
15:58a five-pointed star.
16:02It's a pentangle.
16:06It's amazing.
16:08With just a little bit
16:09of ticket.
16:09Now,
16:12we started
16:13into paper folding.
16:15And once you start
16:16in paper folding,
16:17you never know
16:18where it's going to lead next.
16:19This is a flexagon.
16:21It's a hexaflexagon.
16:22It's got six sides.
16:24One side,
16:25two sides.
16:26That's mark three.
16:27That's mark six.
16:30That's mark one.
16:33Hang on.
16:34Can't find my way through there.
16:35Six sides.
16:36And that's made
16:37with a straight strip of paper.
16:38You could have made that
16:39with the bus tickets
16:40you've got in your hand.
16:41This is a three-dimensional one.
16:45And it's...
16:46I'll turn it that way.
16:47And it opens up
16:48like a kaleidoscope.
16:55Isn't that amazing?
16:56There you are.
16:57Have a look at that.
16:59Now,
16:59once you're starting
17:00paper folding,
17:02as I say,
17:02you never know
17:03where it's going to lead
17:03because it's used
17:04in industry.
17:07Frequently used in industry.
17:09for packaging.
17:11I've got something here.
17:12Watch this.
17:14It's a round ball.
17:15Look at that.
17:17And we've got
17:18a pyramid here.
17:19Can you come down here?
17:21And stand there.
17:22Could you
17:22pull this out?
17:24Can I have
17:25me elastic band?
17:26Yes.
17:26And don't let go
17:27the pyramid.
17:28I've got something else.
17:30Now,
17:31that's perfectly flat.
17:33What do you think
17:33is going to be inside?
17:35Watch it.
17:35Don't let go.
17:40Look at that.
17:41A liner
17:42or a cargo ship
17:44with a crane
17:44that works.
17:47With another crane
17:48at the back
17:48that works.
17:48There's even furniture
17:49inside.
17:50There's a bridge,
17:51a mast,
17:52everything that a ship's got.
17:54And it all folds
17:55absolutely flat.
18:00Don't open the pyramid.
18:03Go on,
18:03then.
18:03Open the pyramid.
18:04Oh,
18:09well,
18:09while you're
18:10putting all those back,
18:11we'll have a look
18:14at just one pyramid.
18:24This is the
18:25Great Pyramid
18:26of Giza,
18:27built in Egypt
18:28by the ancient Egyptians.
18:30The ancient Egyptians
18:31were the first people
18:32to understand deeply
18:34some of the more
18:35involved concepts
18:36of mathematics.
18:38In fact,
18:39some of the things
18:39they understood
18:40we still don't
18:41quite understand today.
18:44This pyramid
18:45is well over
18:46100 metres high.
18:49And there is more stone
18:50in this one pyramid
18:52than in all the cathedrals,
18:54churches and chapels
18:55built in Great Britain
18:56in the last 2,000 years.
19:01In the middle of the pyramid
19:02there's quite a small chamber.
19:05When it was opened up
19:07they discovered
19:07that the things
19:08inside that chamber
19:09have been preserved
19:10for much longer
19:11than anyone
19:12could have believed.
19:15In recent times
19:17men have built
19:18copies,
19:20scale models
19:21of this pyramid
19:21and they've put
19:23things inside them
19:25in the same position
19:26as the chamber
19:27inside this pyramid.
19:28About one third
19:29of the way up
19:30in the middle.
19:31And they found
19:32that things like
19:33liver,
19:33eggs,
19:34all kinds of food
19:34have preserved themselves
19:36for much longer
19:37than is normal.
19:39And in 1959
19:40a man in Czechoslovakia
19:42built quite a small
19:43model of this pyramid.
19:46Placed it with one edge
19:47pointing north
19:48and inside
19:50a third of the way up
19:51he placed a razor blade
19:53with the edge
19:54on a line
19:54from west to east.
19:57And he was amazed
19:57to discover
19:58that the razor blade
19:59sharpened itself.
20:05While we're in Egypt
20:06here's another
20:07Egyptian picture.
20:12This picture,
20:14an ancient Egyptian picture
20:15was painted
20:16by an ancient Egyptian.
20:17Do you notice
20:20anything strange
20:20about the people?
20:22They're flat.
20:23They're all standing
20:24with their feet like that,
20:25their arms like that,
20:26they're all facing that way,
20:27but their shoulders
20:28are turned that way.
20:31It's impossible.
20:32Come and stand there.
20:33You can come.
20:34And you.
20:34Can you come and help?
20:36Try and stand like that.
20:38Can you stand on this line?
20:39You stand over there
20:40and you stand there.
20:41What's your name?
20:41Helen.
20:42Helen.
20:42Helen.
20:43And you're?
20:43You're Mohammed.
20:44Okay.
20:45Fine.
20:46Stand like that.
20:47Now put your hands
20:48like that.
20:49Can you see?
20:50And then,
20:50face that way
20:51and at the last minute
20:53turn your shoulders
20:53facing the camera.
20:56You fall over.
20:58Oh, you don't.
20:58You must be Egyptian.
20:59I'm Egyptian.
21:00I brought your mummy
21:01with you.
21:02Ha!
21:03That was very good.
21:05The picture, you see,
21:06is painted in two dimensions only.
21:08It's got height,
21:08it's got width,
21:09it's got no depth.
21:10It's flat.
21:10And all the people
21:12are standing flat.
21:13Can you imagine
21:14what it would be like
21:14living in a flat world
21:16where the world
21:17and everything in it
21:18was flat.
21:19Come with me.
21:20Come with me.
21:28In 1907,
21:30a man called Hinton
21:31wrote a book
21:32and it was all about
21:33a flat world.
21:35It was a round world,
21:36but it wasn't round
21:37in that direction
21:38as our world is.
21:39It was flat
21:40and all the people
21:41were flat
21:43and they lived
21:44on the edge
21:45like that.
21:46It was a big world,
21:47of course,
21:48and they lived
21:49like that.
21:52But he found
21:53it was extraordinary
21:54living in a flat world
21:55because
21:56if you imagine
21:57you're flat
21:57facing that way,
21:59you can't turn
22:00and face that way
22:01because your nose
22:02has to come out
22:03to go back.
22:04So whatever way
22:06you're facing
22:07when you're born,
22:08that's the way
22:09you're going to stay
22:09for the rest of your life.
22:11Problem, wasn't it?
22:12So what he did,
22:13he had all the men
22:13facing that way
22:14and all the women
22:15facing that way
22:15and that solved
22:17quite a few problems.
22:19It didn't solve
22:21this problem.
22:22How do they pass
22:23each other?
22:24You see,
22:24one can't get out
22:25of the way
22:26to let the other
22:26one go past.
22:28So what they had to do
22:29is they had to
22:29climb over each other.
22:31So he made a law
22:32that would be courtesy
22:33for men to lie down
22:35and the women
22:35used to trample over them.
22:37Which is really
22:38what happens today,
22:39isn't it, fellas?
22:40The other amazing thing,
22:42think about this.
22:43Once you're going
22:44in one direction,
22:45you've got to come back,
22:47backwards,
22:48without looking
22:49where you're going.
22:50You'd always be
22:50bumping into people.
22:51Boom!
22:52Oh, I'm terribly sorry,
22:53I wasn't watching
22:53where I was coming back from.
22:56And the other fellow
22:56would say,
22:57oh, you're always doing that,
22:58you get my back up.
22:59I beg your pardon?
23:00Back up!
23:01Oh, right.
23:01Boom!
23:02Oh, sorry,
23:02I wasn't watching
23:03where I was going back from.
23:04They'd be bumping
23:04into each other
23:05all the time.
23:06What about the houses?
23:07Well, they wouldn't live
23:07in houses,
23:07they'd live in flats,
23:08wouldn't they?
23:10But the doors,
23:11you see,
23:12the doors couldn't open
23:12like that,
23:13so the doors
23:13would have to hinge
23:14up and down,
23:15like that.
23:16But just think,
23:17if somebody opened
23:18the front door
23:18at the same time
23:19that somebody opened
23:19the back door,
23:20the house would fall down.
23:22So it'd be an amazing world
23:24of narrow-minded people
23:25and flat-footed people
23:27all bending over backwards
23:28and clambering over each other
23:29and saying things like,
23:30you scratch my back
23:31and I'll scratch your front.
23:33Luckily,
23:34we today live
23:35in a three-dimensional world
23:36and we now have
23:38three-dimensional pictures.
23:40here is a glass plate.
23:47It's ordinary glass
23:48in a frame.
23:53But watch what happens
23:54to the glass
23:55when I shine
23:56some light onto it.
23:58The light is coming
23:59from this
24:00because this
24:01is a ray gun.
24:03It's called
24:07a laser
24:07and it produces
24:09very, very strong light
24:11and it shines it
24:12in a very, very thin beam.
24:15We've got a lens
24:16at the end here
24:17which fans the light out.
24:20There it is.
24:22It's shining on my hand.
24:24And it's not hot.
24:25Some lasers are very hot
24:26but this one
24:27isn't as hot
24:28as a light bulb.
24:29It's quite cool.
24:31And look
24:32what happens
24:33to the plate
24:33when the light
24:35shines onto it.
24:41That's a picture
24:42of a glass apple.
24:44But it's not
24:49a flat picture.
24:50It's three-dimensional.
24:53As the camera
24:54moves around
24:55you can see
24:57that we're seeing
24:57another side
24:58to the apple.
25:06Now the image
25:07isn't coming
25:08along the ray
25:09of light
25:10like a cinema projector.
25:12The image
25:13like a photograph
25:14is on the glass plate.
25:18As the camera
25:18moves up and down
25:19you can see
25:21if it moves up
25:23you can see
25:24more of the top.
25:27A three-dimensional
25:28picture.
25:31I've got another one here.
25:33Let's take this one out.
25:38Let me show you
25:38another one.
25:43This one
25:44has been very
25:48skullfully done.
25:57Have a look.
26:03It's a skull.
26:04I wonder if it's
26:05John Rennie
26:05picture on a flat
26:07plate
26:07in three
26:08dimensions.
26:11It's called
26:12a hologram.
26:14And this science
26:15is called
26:16holography.
26:17And it's
26:18very new.
26:20But who knows
26:21one day
26:21we might have
26:22three-dimensional
26:23television.
26:25Can you imagine
26:25what that will mean?
26:26After you watch
26:27Basil Brush
26:27you'll have to sweep
26:28up all the fox hairs
26:29off the sofa.
26:30Well,
26:32anybody fancy
26:32another game
26:33of bingo?
26:34Yes!
26:35Yes!
26:36I see.
26:37You don't mind
26:38do you?
26:39We started
26:39with numbers
26:40so let's
26:41finish with
26:41some numbers.
26:43Could you
26:44hold the pad
26:44please?
26:46And there's
26:46a pen.
26:48And
26:48you take
26:50a handful
26:50of bingo
26:51numbers.
26:52Fairly big
26:53handful.
26:54Oh,
26:54I'm sure
26:54you've got
26:55enough there.
26:56Now I can't
26:56tell possibly
26:57how many
26:58numbers you've
26:58got.
26:59So can I
26:59ask you
27:00to put
27:01some back?
27:02Yes.
27:03There you are.
27:05I've no idea
27:06how many you've
27:06got.
27:06So could you
27:07count them
27:07up please?
27:10Just count
27:10them up.
27:11And could you
27:11write the number
27:12on the pad
27:12so the people
27:13at home can
27:14see how many
27:15you've got?
27:18Is it a
27:18two-figure
27:19number?
27:20Yes.
27:21Right.
27:22Add the
27:23digits.
27:23For instance
27:24if it was
27:2434 you would
27:25add 3 and
27:264 and get
27:267.
27:28Have you
27:29done that?
27:29Yes.
27:30And that
27:30new number
27:31put that
27:32number of
27:32counters
27:32back in
27:33the back.
27:37Done it.
27:38All right.
27:39Now
27:39the ones you've
27:40got left
27:40put some
27:41in one
27:41hand
27:41and some
27:42in the
27:42other
27:42hand
27:43and close
27:44both
27:44hands
27:44tight
27:45and turn
27:47the pad
27:47over so
27:48that I
27:48can't
27:48see it.
27:50I hope
27:51this works.
27:52Yes.
27:52Have you
27:53done that?
27:53No.
27:54Which hand
27:55would you like
27:55me to guess?
27:55This one.
27:56How many
27:57are in
27:57that hand?
27:57Three.
27:58So in
27:59that hand
27:59there must
27:59be
28:00six.
28:01Yes.
28:02That's right.
28:03Round of
28:03applause.
28:05Thank you very
28:05much.
28:13If you'd like
28:14to know
28:15how that
28:16trick is
28:17done
28:17drop me
28:18a line.
28:18Johnny Ball
28:18think of a
28:19number
28:19BBC
28:19London
28:20and we'll
28:21try and
28:21explain.
28:22But please
28:23put a
28:23six and a
28:24half
28:24any
28:24stamp
28:24and an
28:25envelope
28:25inside.
28:26Because you
28:26see if I
28:26had to
28:27buy
28:27one six
28:28and a
28:28half
28:28any
28:28stamp
28:28today
28:29two six
28:29and a
28:29half
28:30any
28:30stamps
28:30tomorrow
28:30and four
28:31six and
28:31a half
28:31any
28:31stamps
28:32the next
28:32day
28:32and eight
28:32six and
28:33a half
28:33any
28:33stamps
28:33oh my
28:35wages
28:35would have
28:35gone.
28:36Alright.
28:37We started
28:37with numbers
28:38and we
28:39finished
28:39with numbers
28:40and the
28:40amazing
28:41thing is
28:41with numbers
28:42you can
28:43prove
28:43just about
28:44anything.
28:45For
28:45instance
28:45this
28:46program
28:47was
28:47recorded
28:48in
28:48Manchester
28:49wasn't
28:49it?
28:50Yes.
28:50We're not
28:51in Birmingham
28:51are we?
28:52No.
28:53We're not
28:53in Bristol
28:54are we?
28:54No.
28:55We're not
28:56in Glasgow
28:56are we?
28:57No.
28:58So if we're
28:58not in
28:58Birmingham
28:59not in
28:59Bristol
28:59not in
29:00Glasgow
29:00we must
29:00be
29:01somewhere
29:01else
29:01wasn't
29:01we?
29:02Yes.
29:03And if
29:03we're
29:03somewhere
29:03else
29:04we can't
29:05be
29:05here.
29:06Goodbye.
Recommended
24:32
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