TÜVtel 4.15 - Children´s Magazine

The children's magazine from TĂœV Rheinland

2015 | Edition 4

Poster: Loud animals and tricky giant puzzles

ble: Insepara c d musi Math an

hecking C : s e p o l the s interberg Safe on W n i s t chairlif

Always ready to play

Contents

In this issue you will find ...

Fast facts 4 Video games 6 Volume 10 Adhesives 12 Chocolate 14 Tess and Roby 16

Math

Everything about adhesives and how they hold our world together.

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TĂœVtel

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12 Wit'satstchicoukyt,!

Why bees build hexagonal honeycombs.

olate is This is how choc es. made into shap

Video games have had a bad But reputation for a long time. es are now it's clear: the right gam . not only fun, but also clever

Behind the scenes 20 Have a go!

22 Puzzles 23

ExperiMINT

A to ur of the factor y

Learn by playing

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What are yo u checking there?

Shortly before the ski season: Matthias Schm idt checks the cabl e cars and chairlift s on the snowcovered slope.

music d n a h Mat y

Hey, TÜVers!

d s to stu Tess ha ! w e t h s.

W math te t x e n e for th er how hows h s y b o R much akes it music m easier.

There is a proverb that says: one man's meat is another man's poison. This is also true when it comes to playing video games. While the winner is celebrating a victory, the loser is sulking.

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But there are plenty of games that involve much more than just winning and losing: the aim is to learn lots of things easily while having fun. Often, you can also solve problems together, rather than compete against each other. These games are called serious games. You will learn all about this in the cover story.

We hope you enjoy reading

In yo ur ears

Tess and Roby

TÜVtel tells you when a sound becomes a noise.

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The roaring of lions! The trumpeting of elephants!

What it means when animals get loud.

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Im Tierreich wird gebrüllt, geschrien und trompetet hält. Das Gebrüll , was das Zeug des Löwen ist eine Warnung. „Achtung, hier Damit sagt er: jage nur ich!“ Auch der Brüllaffe Revier zu verteidige schreit, um sein n. Bei ihm brüllt gleich die ganze um Eindringlinge Affengruppe mit, zu verscheuchen.

Frösche quaken und zeigen so, gegeneinander wer der Chef im Teich ist. Gleichzeit Froschkonzert ig soll das die Weibchen beeindrucken.

Auch Fledermäu se sind Schreihäls e. Das hilft ihnen Nahrungssuche. bei der Sie kreischen ihre Beute in der wird reflektiert, Dunkelheit an. also zurückgew Der Ton orfen, und die wo der Leckerbiss Fledermäuse wissen, en steckt.

von Franz Gerg/Comic-Agen tur Roberto Freire; zmin, Shane Gross, istockphoto.com: L Galbraith; fotolia.com: Anke van Wyk

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TÜVtel

3

Fast facts

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Maybe yo even flo r o e r to ks the toy s also thin d n a l in e es are TĂœV Rh g machin in y fl y d e opinion spe is of the t u b , g ey are excitin t toys. Th o n e r a y see that the tes te d to g in e b se d for cur rently can be u y e h t r e ras, wheth ith came w d e t it long work. F can fly a s r e ar t p o ic mult es or so l in b r They u t d w in damage. r o f k y bridges, o and easil ns and lo ly io k t a ic l u l q a t s e in mor his much can do t uld. erson co than a p

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Ancient turtle

This is wh at the habitat of the turtle mig ht have lo oke d lik e.

TĂœVtel

4

Scientists from the Senckenberg Resear ch Institute in Frankf urt am Main have mad e an as tonishing discov er y: the oldest known foss ilize d sea turtle. The bone s and shell are at leas t 12 0 million years old.

The skeleton of the rept ile is almos t co mpletel y preser ve d and near ly two meters long. It was discovered in Co lo mbia in 2007, but has on ly now been examined clos ely and date d.

ars Po lar be ng are amo t es the larg that rs pre dato land. live on

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teaching r o f d l too co ys ing da

The trick of phy sics

Po lar bear mot hers do not wan t their newborn cubs to freeze.

So they use a tr ick of physics.

They build a sp ecial birth den in the snow. He re, the entrance is lower than th e actual den. So a so -calle d co ld trap is crea te d there. The bo dy heat of the bears heats the air in the den.

Because war m air is lighter th an co ld air, it rise s and remains in the den inst ead of escaping thro ug h the en trance.

hav But ard of e h 's eather. e w n t o o y h r Eve e to off o o l du ts have days off sch n he s tu de ather. T w e e f w y d r l ve co erian due to the Sib m an o r f scho o l s ussia c g irl R d n i n a n n. boys myako nd the y a O f w o o n village o this e co ld ward t r o f e to th k u elow d lo o l o drop b cho s s e f r f u o t pera Days st hen tem ius. The lowe w r u c oc els was a grees C orde d -54 de c e r e r ees atu 2 degr .

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TĂœVtel

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Video games

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TĂœVtel

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Paul and Yasmin are best friends. They do homework together, love pizza, inline skating and watch the same TV series. Only one thing makes them tick quite differently: Yasmin is a huge fan of video games.

Paul finds video gaming goofy. "It makes you dumb," he says. Yasmin rolls her eyes and counters: "That's not true. There are many games where you have to come up with a lot of ideas in order to make any progress. That makes you smart, not dumb!" Paul's having none of it: "But what about games where you shoot stuff...?" begins Paul. "Are you crazy? Games where you shoot stuff?" Yasmin cuts him off.

"I don't have any games where you shoot stuff!"

Every game is different Yasmin does not own any games featuring war and violence. But who exactly is responsible

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for computer games having a bad reputation? Studies have shown that violent games can make you aggressive. This is especially true for people who do nothing else. But more and more games are being developed that encourage logical thinking and the ability to learn something. Yasmin's favorite game involves dancing to casual dance steps. "There's no way I'm dancing," says Paul. "You don't have to," laughs Yasmin. She rummages around in her drawer for three more games and holds them out right under his nose. "Would you like to solve a puzzle, explore the ocean or build a city?" she asks. Paul opts for the sea adventure.

He quickly comes to the conclusion that this game is pretty cool.

Read more on page 8 →

TĂœVtel

7

Video games

Games like the ones Yasmin calls "serious games".

That's actually a funny way to describe them, because the games are anything but serious and boring. Usually, exciting tasks have to be mastered. The fact that you learn things passes by almost unnoticed. "Serious games are not only for children," says Christoph Hieber of TÜV Rheinland, who adds: "Even adults learn a lot from interesting or amusing games rather than by reading boring documents." He is certain of this, because he and his team have developed online training programs at TÜV Rheinland. For him, serious games are a fun way to learn. But will your grades at school improve if you play them for hours every day? "No, whoever does that will perform rather poorly at school, because

he or she will think about nothing except playing games," says the expert on educational games.

learn by playing That's why Yasmin and Paul have also agreed to play soccer in the park again tomorrow.

Ultimately, every game teaches you something.

Playing soccer enhances your endurance and skill, and teaches you how to fit into a team and how to deal with defeat. This is not the kind of knowledge you learn at school, but it is nevertheless important and excellent training for the brain. And the day after tomorrow? The newly crowned gaming fan Paul would like to End try Yasmin's puzzle game.

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Cerebellum This controls your s movements and ha ds placed significant deman erate on it when you op ly and the controller quick hands. ur precisely using yo TÜVtel

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Prefrontal co rtex This is respo nsible for planning and logical thoug ht.

You need this to solve difficult tasks when playin g.

Right h ippocam pus This are a accom modate your se s nse of o r ie ntation You use . this a lo t when you mo ve throu gh vide game w o orlds.

Whipping you into shape without gaming!

The brain can be trained in various ways. TĂœVtel knows five tricks to stimulate your gray matter.

You don't necessarily need video games for this.

1.

3.

Z, Y, X, W ... not so easy.

Reading provides your brain with a workout. It has to work even harder if you hold the book upside down.

Recite the alphabet backwards.

2.

Making up stories trains your brain. This can be done in pairs: One person thinks of five words that the other person has to use to compose a short story.

I think stories about space are the best.

4.

Learn new languages, sports, board games or instruments.

This creates new connections in your brain and spurs your memory.

5.

dle index, mid Bend the our ngers of y and ring fi of to the palm right hand d the . Now ben d n a h r u o y nd le finger a thumb, litt left r on your ring finge the alternate hand. Now gers of your fin positions forth. back and

TĂœVtel

9

Volume

! e s a e l p Quiet, to burst, Theresa's head is about e level is that's how high the no is hes she around her. How she w is mp right were a rock-boring shri urself. now. Why? Rea d for yo Theresa is annoyed. On the street outside her window construction workers are crushing concrete with a jackhammer. The neighbor's dog doesn't like it either. It is barking at them nonstop. So that he doesn't have to listen to the hammering, Theresa's brother Lukas has now also turned the music in his room up until the hammering stops.

"This is unbearable!" yells Theresa, as she puts her index fingers in her ears. This does help a little against the noise, but on the whole it is quite impractical. Especially when you have to do homework.

For the first time, she envies her grandmother. At times like these, she just switches off her hearing aid.

The greatest weapon is its pincers.

TĂœVtel

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e world h t in l a im n a The lo u dest rimp. ck-boring sh That's the ro this are safe from Only gobies imals eapon. The an deafening w p burrows ile the shrim co-exist. Wh d the the fish guar into the lair, entrance.

Theresa's hearing is good and works unimpeded, day and night.

Even when she is asleep. The inner ear contains about 15,000 hearing cells. They receive the sound waves, process them into signals and send them to the brain. That's how hearing works.

Three questions for Claude Origer He works at TÜV Rheinland in the field of noise and environmental protection.

What is noise, actually?

We make a distinction between sound and noise. Sounds are the smallest changes in pressure in the air that we can perceive with our ears. We only talk about noise when we deem this sound to be unpleasant.

Theresa is thinking. The rockboring shrimp comes to mind. It is the loudest animal in the world.

This sea creature can generate a colossal crack with its pincers - up to 200 decibels. A jet plane only generates up to 120 decibels. So the shrimp cracks its prey easily.

The prey falls into a state of shock and the shrimp eats it. "One needs to be a rock-boring shrimp," thinks Theresa. She imagines being able to ensure silence with a simple hand gesture. Crash, bang ...and silence. Without having to eat anyone, of course.

Suddenly Theresa pauses and gingerly removes her fingers from her ears. All is quiet again. Looking out of the window, she sees that the construction workers have finished their work for the day. The neighbor's dog is relaxing in front of its kennel and Lukas has turned his music down again. "There you go," thinks Theresa. She takes a deep breath and hunches over her homework.

Can noise make you ill?

Yes, if our ears are subjected to loud noise over a long period, our hearing can be ruined. For example, when listening to music with earphones. Many MP3 players have outputs exceeding 100 decibels. So please do not turn up the volume.

How is noise measured?

For this, we use sound level meters. For example, we place them around a car and measure how much noise it emits. Colleagues in Yokohama, Japan, take measurements in an acoustics laboratory to see how loud equipment is when it is in operation. In the picture, they are testing a sewing machine. In order to eliminate background noise, this is done in a soundproof room. There you really only hear the sound of the sewing machine.

A look at the acoustics laboratory in Yokohama, Japan.

erts from How loud is a car? Acoustics exp TÜV Rheinland can measure it.

TÜVtel

11

Adhesive

What keeps the world together Why doesn't ad

hesive stick in t he tube?

It's becaus e: it contain s solvents.

So the adh esive rema ins liquid.

At least un til it comes into contact wit h air. Then the solvent ev aporates a n d the adhesive fi rst become s sticky, and then hard.

e Adhesives act mostly invisibly. W longer only notice them when they no adhere properly. absolute chaos: Life without bonding would be Stamps would slide off wallpaper would roll off walls. lose their labels and shoes the envelopes. Tin cans would tons would no longer be would lose their soles. Juice car sters would peel off wounds. able to contain their drinks. Pla of sheets of paper, then the Books would collapse into a pile te into dust because paper sheets of paper would disintegra niture breaks down into its also consists mainly of glue. Fur n cars, which contain several component parts, as do moder phones and computers break kilograms of adhesive. TVs, cell t s are bonded. We quickly see tha because electronic component cranny and keeps our world adhesive covers every nook and stuck together. bonding their weapons and The Neanderthals were already y used resin for this. This is tools over 45,000 years ago. The k of trees. Today, most a sticky sap found under the bar ally. There are adhesives are produced artifici noacrylates, hotvarious adhesives, such as cya . Some can be melt adhesive or adhesive film such as sticky removed again after adhesion, y notes. Others adhere so strongl that they are even used to bond aircraft parts together.

TĂœVtel

12

panel Bonded solar

ed layers. t of many bond is ns co ls ne pa Solar roof well, because re to each other he ad t us m ey Th ain on the nels have to rem pa r la so e th in d the cells they are expose 25 years. There t as le at r , fo in ra of ro ind, s such as sun, w or ct fa l ta en nm to enviro experts check TĂœV Rheinland, At e. ic d an ow sn l enough ick together wel st rs ye la e th er wheth ecial tester. It is done with a sp to endure. This her words: rength. Or in ot st el pe e th s re measu until the must be applied how much force e layers. ves between th adhesive dissol

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er ave v h y e sure e: th caus irs en e a b act h s ' e It cont t. Th e l . In e b e i f eads oss r p h hairy t t s y rom malle the stick rips f the s d h t i e v ce w hesi the surfa he ad lly: only t , n o i a ded addit . Incident are provi r est ai ds The r the h rse threa . e v i ve . dhes trans s of a esive-free p o r d h h d t wi b is a e we h t f o

ing gum doesn't chew outh? stick in the m

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watere gum base is th e: us ca be 's It to wet does not stick repellent, so it esent in a is always pr iv al S . es ac rf su ewing prevent the ch the mouth to gum can king. Chewing ic st om fr m gu surfaces l to dry, rough stick really wel oe soles and is like roads or sh ove. difficult to rem TĂœVtel

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Chocolate

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e d a m s i t i w o h How is chocolate This is transformed into a sweet s e p a h character? TĂœVtel has into s investigated this by Start The chocolate is brought to the right temperature in large tanks, so that it flows well and will not stick to the pipes.

The chocolate man molds are ready. A measured amount of the liquid chocolate is poured through into molding heads.

Each mold has a counterpart that remains empty.

TĂœVtel

14

looking at the company RĂźbezahl Schokoladen in southern Germany.

The empty mold halves are placed onto the filled mold halves and are conveyed in the direction of the rotation system. They are rotated in all directions. The chocolate flows along slowly on the inner sides of the molds, cools and solidifies. This results in figures Precious bean that are hollow inside. Experts call them hollow figures.

Researchers be lieve that human s were Then suction devices lift already aware of cocoa beans in Central America over 3, the finished chocolate men 000 years ago. Th ey used these to prepar carefully onto a conveyor e a chocolaty be verage. It was considered sacr belt. ed, which made th e co co a very valuable. Th beans ey were even us ed to make payment. Today, chocolate and co coa are cheap because they are massproduced.

s COCOA Where doe ? come from

ou need colate, y r and o h c k il ce m suga to produ utter as well as r e d r o from In b btained d cocoa o n e a b a n o a c co hc a der. Bot he coco milk pow of the fruit of t io reg ns s grow in the seed s e re t a co p all tree. Co and dam t o h is where it nd, such as the est year rou ast in W Ivory Co a.

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The more cocoa there is in the chocolate, the more bitter it tastes.

Aim The naked chocolate men are placed by hand into the winding machine and wrapped in colorful foil. The staff put the figures in so-called trays. This prevents them from falling out and breaking during transport. Packed safely, the chocolate men wait in the warehouse until they are shipped around the world.

TĂœVtel

15

Tess and Roby

That's what math sounds like Mathematics and music are two of the oldest sciences. And they have more in common than you think. Roby proves it with the monochord.

Mini quiz 1

How many keys does a piano normally have?

A 20 white and 68 black B 52 white and 36 black C 44 white and 44 black

2

A violin bow is composed mainly of what?

A Thin woolen threads B Rubber bands C Horsehair

3

What is the hole in the body of a guitar called?

A Sound hole B Resonance trough C Resonating body Correct answers: 1B, 2C, 3A

TĂœVtel

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The purest s ound

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m C to The distance fro tave.

C' is called an oc

Three quarters times twelve eighths? Four quarters minus three halves? That's ... about ... um, no idea. Tess is sitting hunched over her math homework. Fractions are not really her thing. Roby looks over her shoulder and says: "It's not that complicated." That's easy for the robot to say - he does arithmetic faster than a calculator.

Tess admits that she is also just not interested in arithmetic. She would much rather be spending time on her new hobby: practicing guitar. She thinks that music is much cooler than math, anyhow. "Strictly speaking, they both depend on each other," says Roby.

Huh? Why's that? The robot asks Tess to take a look at her guitar practice book. "Here, one whole note fits into a four-four beat. Or two halves.

Or four quarters. Or one half and two quarters. That's because all these combinations have the same value," he says. Tess pauses. There really are fractions in her music book. Why has she never noticed

The Greeks di scovered thou sands of years ago that mathematical patterns are concealed in m usic. A scale, fo r example, is a series of ei ght notes (her e, from C to C'). They as cend at the sa m e interval and are called octaves. If you sound the lowest and hi ghest notes to ge ther, it sounds partic ularly nice. Th e reason: C' has precisely twic e the number of sound waves per second as C. An octave is the purest sound.

this before? "And here, look," continues Roby. He fetches a monochord from the cupboard. It's an instrument with only one string. He plucks the string. A tone sounds. Then he bisects the string with a piece of wood and first plucks only one half and then the other half. The tones are higher than before, but sound exactly the same. The ratio is 1:1. Then he halves the string so that one is twice as long as the other. The ratio is now 2:1 and a high and a low tone sounds. They sound very good together. "Simple ratios always sound good, while ratios of 15:8 or 45:32 sound off."

Tess is fascinated. "Did you invent the monochord?" she asks. No, it comes from the ancient Greeks. They therefore discovered that you can describe sounds and pitch intervals using numbers. Without this mathematical knowledge, there would be no music. "You see, if you find music cool, then you have to find math at least as cool," laughs Roby. Then he taps the desk. So this is where the action is now! Tess can only laugh and begins to study.

Read more on page 18 →

TĂœVtel

17

Tess and Roby

And then it's Thursday. Feeling good, Tess sets off on her way to school. Math is scheduled right at the first lesson. The teacher hands out the test paper.

Some students sigh when they see the questions, while other look at a loss. Only Tess begins to calculate the answers, smiling as she does so. She hums happily to herself: "One, two, three, da, da, da, tra, la, la ..."

"Pssst, that's enough of the humming," complains the teacher. Oops, Tess didn't notice that she had been making so much noise. "Sorry," she says. Even without humming, the problems on her test paper almost solve themselves.

a tester r t s e h c r o e h T

a, nothing in an orchestr s te no r ei th t can play s if the violinis If all musicians What happen ? it ld ou sh r O e ng. ho arranges th should go wro rformance? W pe a to r io on pr e ar breaks his arm the musicians instruments if e th of one on ti as ta st Ju transpor too expensive? om ro l sa ar he tra. TÜV tour? Is the re test an orches to le ib ss po is s, it The orchestra can test object oncerto Köln.

C h it w is th d consider Rheinland does inute detail an m in ng hi yt e ever ove so that testers examin d what to impr an to n io nt te what to pay at smoothly. everything runs

TÜVtel

18

e Concerto Köln at a performanc d. roa and on the

"What was up with you?" ask her classmates after the test. "I just had fun with the arithmetic," replies Tess.

Fun in a math test? Nobody can quite believe that.

Tess explains that she now always has to think about music during math. And that fractions are no longer so tedious.

In the afternoon she happily tells Roby that her test went really well. "Then you've now got time to play the guitar," says Roby. And because making music is much more fun in pairs, he now wants to learn an instrument too. But which one? Find out on the back page which instrument he decided to learn.

End

In math, one m easures distan ces with a rule out the distan r. In music, on ces between no e can find te s by counting and have vario . They are calle us names. The d intervals interval betwee called prime. Th n two identica e interval betw l notes is een two adjace Three note step nt notes is calle s are called th d second. ird, four quarte seventh and ei r, five fifth, six ght octave. sixth, seven

Can you as ls their the interva names?

A

B

Third

Octave

C

Fifth

D Prime

Correct answers:

Mini qusiz ign

A2, B4, C3, D1

Counting inte rvals

1

2 3 4

TĂœVtel

19

Behind the scenes

?

u o y e r What a e r e h t g Testin

Chairlifts

From the maintenance basket, the tester inspects supports and rope pulleys.

Matthias Schmidt must be free from giddiness.

Safe on the mountain In winter, the snow-covered slopes are full of skiers, snowboarders and sledders. They have a lot of fun hurtling down the slopes at great speed. They use tows and chairlifts to get up the mountain in the first place. These are to be checked regularly: chairlifts annually and tows every two years. Matthias Schmidt and his colleagues from TĂœV Rheinland check the tracks from top to bottom, for instance in Winterberg in Sauerland.

Cables, control systems, safety switches – Matthias Schmidt's expert eye misses nothing. "We look at the mechanics and electronics of the system. Since we cannot test every single screw, we do random tests," says the inspector.

Matthias Schmidt Makes sure going up and down the ski slope is safe.

TĂœVtel

20

In recent years, a lot of money has been spent in Winterberg to make the chairlifts even safer. For example, there are locked restraining bars, which may only be opened at the station, and trained personnel who watch carefully when people get on and off.

All safety switches for releasing the brakes must be tested.

To test the brakes, the chairlifts are burdened with loads of up to 640 kilos.

The thick steel cables on which the chairs hang must withstand a lot of weight.

In the summer, Matthias Schmidt joins his colleagues to check the chairlifts at a dizzying height. Here in Cologne.

The chairs are driven through the station by tire conveyors. The inspector checks the safety switches and distances.

Diaphragm switches that monitor the locking of the clamp on the cable are carefully checked.

The clamps that hold the chair on the rope are disassembled and individually inspected on the clamping bench.

TĂœVtel

21

Experi MInT

Math

Infor

Cleverly filled

cien

atural s

ce

o gy nol

Tech

Because a lot fits t way to save space. ea gr a are ns go xa He this test: xagon. Check it with perfectly into one he

You need: f of rope • a piece o of coins, • a variety k 10 cent TÜVtel too pieces

1 the Knot the end of rope and form a square.

2 hat ins so t o c h it Fill it w le can s possib a y n a hem as m Count t . in d e in be fitt umber d the n r o c e r and t table. the tes

= = = =

Result: Hexagons and circles have the smallest circumference for the greatest volume. That's why their surfaces can be filled with the most volume.

Can bees do math?

No, they can't. Nevertheless, they use wax to build the walls of their honeycombs all in hexagonal shape. And that's good, because on the one hand, the most honey fits in one honeycomb. In addition, no gaps are created between the individual honeycombs, as would be the case with circular honeycombs. Each wall is used twice. Thus, one can say TÜVtel that the hexagon is the most compact form.

22

MINT is the abbreviation for Math, Informatics, Natural science and Technology. All four are exciting areas in science.

Today: M for math

ic m at s

N

Have a go!

3

Either try it yourself using all the shapes, or count the coins in the photos, record the results and compare them.

m

Puzzles

n Build a snowma

The solutions can be found on the back of the TÜVtel.

ot, a For a snowman you need: a carr ps lum broom, a scarf, a hat and five of coal. How many complete snowmen can be built out of the parts?

Wish s ' a m d n a r G

er six as invited h Grandma h colate n to eat cho re d il ch d n ra g me, y of a welco cake. By wa f them that each o she wishes hands ach others will shake e hands w often are properly. Ho shaken?

k n i r d e t i r o Fav

22 + 77 = L 32 – 17 = W 5x6=C 36 : 9 = H 44 – 28 = T 38 + 46 = I 72 : 3 = E

ost in rink m d o t g the solvin ss like e y T b s t e u o s to a do pond n find What s a e c r r u o r? Yo box. sult c winte ach re priate E o r . s p n p io the a equat e it in t i r W . letter 4

49

16

30

15

84

16

4

30

4

24

72

4

49 15

25

30 84

49 21

99 21

72 24

7x7=O 33 – 8 = M 7x3=P 9 + 63 = A 47 – 2 = D 28 : 7 = R

16

? ?

24

45

TÜVtel

23

COPPER

R A G E N I V S T MEE

Two similar experiments, two different results.

Experiment 1

You nesed

Result 2

How come?

Place a coin on a piece of paper towel soaked in vinegar. Result: After a few hours, verdigris appears on the underside of the coin.

r co in • Co ppe r a g • Vine towels r e p a • P s • A glas

Experiment 2

Place a tarnished copper coin in a glass filled with vinegar. The coin must be completely immersed. Result: After one day the coin will shine like new.

Result 1

Solution

Wow, you already play really well.

Air makes the difference. Once it combines with copper and vinegar, toxic verdigris is produced. If it does not combine with copper because the copper is immersed in vinegar, the acid in the vinegar dissolves the dark layer of the coin and it shines.

TESS and ROBY

The new instrument

Yes, I play the tambourine, trumpet and drums. We could perform as a duo.

Ha, but you're a trio all on your own!

Thank you. Have you now also finally decided what instrument to learn?

TÜVtel – who did it?

Publisher: TÜV Rheinland AG, Corporate Communication Am Grauen Stein, D-51105 Cologne Responsible: Aud Feller Editor: S+L Partners GmbH, Cologne Printing: Druckhaus Ley + Wiegandt, Wuppertal Photos: All Tess and Roby illustrations by Franz Gerg/Roberto Freire Comic Agency; 123rf.de: Stoyan Haytov (p. 2, 22), Benoit Chartron (p. 3, 9), andreanita, Danai Chidsin , sergeyp (p. 4-5, 5), Roman Petlya (p. 12), stocksolutions, anest (p. 13), jirkaejc, Norman Kin Hang Chan, Valentyn Volkov (p.

15), Irina Tischenko (p. 22), vectorlart (p. 23); fotolia.com: PRILL Mediendesign (p. 2), Anke van Wyk, pandawild, jpramirez, macrovector, djvstock (p. 3), Jacek Chabraszewski (p. 3, 10), tovovan, arturaliev, Aleksandr Bryliaev, Dirk Schumann, eyewave (p. 4-5), valdis torms (p. 4-5, 22), verkoka (p. 6-7, 9), Song Heming (p. 10), antipathique (p. 10-11), pete pahham, Jan Engel (p. 12-13), sumire8 (p. 24); shutterstock.de: Pabkov, Ivan Kuzmin, Shane Gross, L Galbraith (p 3), Doggygraph (p. 9), egg design, bluecrayola (p. 12-13), Aleksangel (p. 23); istockphoto.com: Charles Schmidt (title), webphotographeer (p.

2), Patrick Gijsbers (p. 3), asmakar (p. 5), Fredex8 (p. 12-13), ParkerDeen (p. 14), vostal, kosmozoo, Bob Vidler (p. 16), rusm (p. 22), Victor_Brave (p. 23); Reinhard Witt (title, p. 2, 20-21); Rübezahl Schokoladen GmbH (p. 2, 14-15); Disney•Pixar (p. 2, 23); the Good Evil GmbH (p. 2, 8, 23); myToys.de (p. 2, 23); TÜV Rheinland (p. 4, 11, 13); Jorge Blanco (p. 4); Nemetschek Stiftung (p. 8); Florian Profitlich/Concerto Köln (p. 18); S+L Partners GmbH (22, 24)

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Grandm

ere 21 There w kes. a h s hand : 2 = 21 7x6 = 42

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