Unit 1 1
Text A:Genetically Modified Foods—Feed the World? 1
Text B:Genetically Modified Foods:Are They Safe? 12
Unit 2 17
Text A:The Biology of Skin Color:Black and White 17
Text B:Immortal Avatars:Back up Your Brain,Never Die 28
Unit 3 33
Text A:Can Dirt Do a Little Good? 33
Text B:Urban Air Pollutants Can Damage IQs before Baby's First Breath 47
Unit 4 52
Text A:Is Time Travel Possible? 52
Text B:Building a Time Machine 62
Unit 5 66
Text A:The End of E-mail Age 66
Text B:E-mail Gets an Instant Makeover 75
Unit 6 79
Text A:Are Cell Phones Safe? 79
Text B:Want to Know Your Disease Risk?Check Your Exposome 89
Unit 7 93
Text A:Seeing the Earth for Its Faults 93
Text B:Can Geothermal Energy Pick up Real Steam? 104
Unit 8 109
Text A:Why We Are Fat? 109
Text B:More Protein,Less Refined Starch Important for Dieting 118
Unit 9 122
Text A:The History of UFOs 122
Text B:Is Stephen Hawking Right about Aliens? 133
Unit 10 138
Text A:Video Gamers Can Control Dreams,Study Suggests 138
Text B:Dream States:A Peek into Consciousness 148
Unit 11 152
Text A:For Mobile Touch Technology,It's Only the Beginning 152
Text B:It's a Smart World 162
Unit 12 167
Text A:Fact or Fiction:The Days(and Nights)Are Getting Longer 167
Text B:The Primal and Future Moon 179
References 183