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Unit 1 Age of the Universe 1

Unit 2 Dinosaurs and Birds 8

Unit 3 Electric Cars Hit the Road 15

Unit 4 Leonid Meteor Shower 22

Unit 5 Penguins Dying 31

Unit 6 African Dust Storms 39

Unit 7 Cloning Pigs 47

Unit 8 Self-healing Plastic 54

Unit 9 Progress in Stem Cell Research 62

Unit 10 Gigahertz Chips 70

Unit 11 Global Warming 80

Unit 12 How Long Can Humans Live? 89

Unit 13 Lightning Strikes:BEWARE 98

Unit 14 Nobel Physics and Chemistry 107

Unit 15 A History of Modern Computing 117

Answers 128