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