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You: Did you know?

You: Did you know? You: Did you know? 2017

Did you know an adult male lion’s roar can be heard up to 8km away, soldiers used to live inside the Great Wall of China and there’s a wasp that can beat a tarantula in a fight? The latest edition of YOU Did You Know? is on sale now and packed with all sorts of facts about our universe that will keep kids enthralled for hours. There are 46 colourful and detailed illustrations with subjects ranging from big and small animals to famous people and structures, as well as space and more. It’s also a great gift for kids if you’re on a tight budget.

South Africa
Media 24 Ltd
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in deze editie

2 min.
from the editor

DID YOU KNOW? THE air around a lightning bolt is hotter than the sun, our feet produce up to a cup of sweat a day, a cheetah can only maintain its top speed for 10-20 seconds, a scorpion can survive being frozen – this magazine is just packed with so much interesting information! The team working on the magazine lost track of the number of times someone announced, “I didn’t know that!” and had to share. All the information is shown in 46 colourful and detailed illustrations done by our talented infographics team. We cover the human body, land creatures, sea creatures, insects, prehistoric creatures, how things work, how things are formed, how things are built plus a section on the planets. And if you scan the 3D icons (there are 18)…

1 min.
check out our cool 3d images!

WANT to see a dinosaur come to life? Well, now you can! All you need to unlock the magic is a smartphone or tablet. The technology is called augmented reality and there are 18 pages in this magazine where it can be used – just look out for the 3D icon (example below and above right). You will see a snake ready to strike, watch a bee in action, get a closer look at the Parthenon in Greece and so much more. Test the feature by downloading the Media24 3D app on your smartphone or tablet (see instructions below right), hold the device about 30 cm above the image below and see what happens to the T Rex! WHAT YOU NEED TO KNOW • The app is FREE to download.• It’s available in the…

4 min.
your body

YOUR BODY IN NUMBERS 45 000 litres the amount of urine you’ll produce in your life 10 billion the number of skin cells you lose every day 5 years How long we spend with our eyes closed after a lifetime of blinking 5 million The number of hairs the average adult has on his or her head and body WOW! • If you’re a germaphobe rather kiss than shake hands. Generally more germs are transferred when you shake hands with someone than when you kiss them. This is because you don’t go around touching things such as doorknobs, computer keyboards or unclean surfaces with your mouth.• Every three or four days you develop a new stomach lining. If this didn’t happen the stomach acids that digest food would also digest your stomach.• The average person blinks about 15-20 times a…

3 min.
the brain

YOUR brain is a powerful and complex structure. It’s the body’s most important organ because it sends out messages (via neurons which are cells in the nervous system) that allow you to function. Your feet, for example, get the message to walk; your jaws get the message to chew and your lungs to breathe. Your brain also allows you to perform abstract actions such as thinking and remembering. THE BRAIN CONSISTS OF THREE MAIN PARTS 1 THE CEREBRUM The largest part of the brain is the cerebrum. It consists of two halves (hemispheres) and is further divided into four areas or lobes: the frontal lobe, parietal lobe, occipital lobe and temporal lobe. 2 THE CEREBELLUM The cerebellum (little brain) is beneath the back of the cerebrum. It’s the secondlargest part of the brain. 3 THE BRAINSTEM This…

2 min.
our senses

SIGHT Light enters your eye through your pupil (the black circle in the middle of your eye). The eye's lens then focuses this light onto the retina which uses calls called rods (black and white) and (colur) to trun what we see into message travels along the optic nerve to the brain. Images are sent to the brain upside down and our brain makes sense of what it receives by turning the image right-side up. SMELL Behind our nose is a space called the nasal cavity. Our sense of smell is thanks to many parts in the cavity. On the roof of the nasal cavity is the olfactory epithelium (a thin tissue) containing receptors (about 10 million of them!) which pick up odour molecules in the air. When these receptors are stimulated, signals travel along…

2 min.
the bones

STRUCTURE OF A BONE Trabecular Bone marrow Cortical bone TYPES OF FRACTURES A fracture is a term for a broken bone. There are many kinds – here are four common fractures. Greenstick: The bone cracks but not all the way through. Bowing: The bone bends but doesn’t break. Torus or buckle: A bone is squeezed on one side, causing the other side to bend. Complete: The bone breaks into two pieces. HOW BROKEN BONES HEAL Once a broken bone is set and placed in a cast, the break heals in stages. A blood clot and bony tissue form around the broken bone. ew bone cells begin to grow towards each other on both sides of the break. The break closes and bony tissue is absorbed by the new cells. DID YOU KNOW? Newborn babies have about 300 bones while adults only have 206! This is because…