دانلود کتاب Did You Know?: Amazing Answers to the Questions You Ask

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Contents 2......Page 4
SPACE......Page 6
How many stars are there? 6......Page 8
Why is the Sun hot? 8......Page 10
What is a planet? 10......Page 12
What are Saturn’s rings made of? 12......Page 14
What is the Moon made of? 14......Page 16
What is a shooting star? 16......Page 18
How fast do rockets go? 18......Page 20
Could people live on the Moon? 20......Page 22
Is there life on Mars? 22......Page 24
THE EARTH......Page 26
How big is the Earth? 26......Page 28
What’s inside the Earth? 28......Page 30
Why do earthquakes happen? 30......Page 32
Why do volcanoes erupt? 32......Page 34
How deep is the ocean? 34......Page 36
Why does it rain? 36......Page 38
What is lightning? 38......Page 40
What is a tornado? 40......Page 42
Where does the Sun go at night? 42......Page 44
LIVING WORLD......Page 46
Are plants alive? 46......Page 48
Why are leaves green? 48......Page 50
Why do plants have flowers? 50......Page 52
How many animals are there in the world? 52......Page 54
Why do lions have fur? 54......Page 56
How do birds fly? 56......Page 58
Are all snakes poisonous? 58......Page 60
How do tadpoles turn into frogs? 60......Page 62
How can fish breathe under water? 62......Page 64
What’s the biggest spider? 64......Page 66
How do caterpillars turn into butterflies? 66......Page 68
Why do wasps sting? 68......Page 70
Do animals have houses? 70......Page 72
Can anything survive in the desert? 72......Page 74
Do lions live in the jungle? 74......Page 76
What is a rain forest? 76......Page 78
HISTORY......Page 80
Did dinosaurs eat people? 80......Page 82
What happened to the dinosaurs? 82......Page 84
Did cavemen live in caves? 84......Page 86
When did people build the first houses? 86......Page 88
What’s inside a pyramid? 88......Page 90
Who were the ancient Greeks? 90......Page 92
What was a gladiator? 92......Page 94
How long is the Great Wall of China? 94......Page 96
Who were the Vikings? 96......Page 98
Who were the Aztecs? 98......Page 100
What was it like to live in a castle? 100......Page 102
What was it like to be an explorer? 102......Page 104
When were locomotives invented? 104......Page 106
SCIENCE......Page 108
Why do ice pops melt? 108......Page 110
Why does metal get rusty? 110......Page 112
Why does fruit rot? 112......Page 114
What is energy? 114......Page 116
Where does electricity come from? 116......Page 118
How does a magnet work? 118......Page 120
What is a rainbow? 120......Page 122
What is an echo? 122......Page 124
What makes a car go? 124......Page 126
Why does a helicopter have a propeller on its tail? 126......Page 128
How do submarines work? 128......Page 130
How does a remote control work? 130......Page 132
How do cell phones work? 132......Page 134
HUMAN BODY......Page 136
What’s inside my body? 136......Page 138
Why do I get hungry? 138......Page 140
How many bones are in my body? 140......Page 142
Why do I have muscles? 142......Page 144
Why do I get out of breath when I run? 144......Page 146
Why does my heart beat? 146......Page 148
What does my brain do? 148......Page 150
How do my eyes work? 150......Page 152
Why am I ticklish? 152......Page 154
Why do I sneeze? 154......Page 156
Index 156......Page 158
Acknowledgments 160......Page 162