DK - WOW! The Visual Encyclopedia of Everything

79 (^3) TASTE Small projections on the tongue, called papillae, house taste receptors called taste buds. Food molecules dissolve ...

Human beings have a limited lifespan but are able, through reproduction, to produce a new generation to succeed them. Male and f ...

81 ▲ TEN WEEKS Now 500 times bigger than a fertilized egg and consisting of billions of cells of different types, the fetus, as ...

82 Though all humans share the same basic body plan, each of us (apart from identical twins) has a unique mixture of features. T ...

83 3 4 (^1) DNA Long molecules of DNA (deoxyribonucleic acid) are found in every body cell. When magnified, DNA resembles a twis ...

NUTRITIONEating a balanced diet is an important part of good health. The food we eat supplies the nutrients required to build an ...

FRUIT AND VEGETABLES 85 ▶ Fruit is a good source of water, fibre, and vitamins, and the natural sugars that give us a burst of e ...

Health Laryngeal mirror is placed in the mouth to check the larynx (voice box) Inhaler is used to introduce drugs, such as those ...

87 PREVENTION Regular exercise, such as running, walking, or playing sport, improves fitness by making the heart and body muscle ...

Science and Contents MOTHERBOARD This computer motherboard is a maze of microchips and other components linked by copper wires. ...

Science and technology 89 088_089_Science.indd 89 03/01/19 12:10 PM ...

Everything in the world is made from elements – pure substances that cannot be broken down into anything simpler. Elements can b ...

ELEMENTS 91 (^6) LANTHANIDES These soft, reactive metals were known as rare earths, because they were wrongly believed to occur ...

An element is a substance made of only one kind of atom. Atoms join, or bond, to other atoms of the same element, or to atoms of ...

Oxygen atom 93 ◀ WATER (H 2 O) When two atoms of the gas hydrogen (H) bond with one atom of the gas oxygen (O), they form molecu ...

An acid is a substance that produces positively charged particles of hydrogen, called hydrogen ions, when dissolved in water. Th ...

95 All bases tend to feel slippery like soap CLEANING FLUID ▶ The strongest bases have a pH of 14 or more. Alkaline solutions wi ...

(^1) REACTION When vinegar (acetic acid) and chalk (calcium carbonate) are mixed, a chemical reaction takes place. The acidic vi ...

Concentrated dye contains more dye particles to collide with the cloth As crystals of potassium permanganate begin to dissolve, ...

Everything you can smell, touch, or taste is made from matter, including living things such as yourself, and non-living things s ...