Unit 1 Artificial Intelligence / 1Text A Artifi cial Intelligence: Friendly or Frightening? / 2Text B AI Summit Aims to Help World’s Poorest / 12Text C Th e Weapon of Doomsday: AI / 20Unit 2 Protect Our Planet / 23Text A How Would Just 2 Degrees of Warming Change the Planet? / 24Text B Th e Risk of Extinction Is Highest for Earth’s Largest andSmallest Animals / 34Text C 7 High-tech Tools to Combat Poaching / 42Unit 3 Virtual Reality / 47Text A How Virtual Reality Works / 48Text B Virtual Reality Helps Distract Kids from Painful MedicalProcedures / 57Text C How Project Morpheus Works / 65Unit 4 Unmanned Technologies / 69Text A Drone Trends to Watch in 2018: Big Data, Flying Taxis,and Home Security / 70Text B Driver-less Cars and How Th ey Would Change Motoring / 79Text C How Amazon Go Will Revolutionize Retail Convenience / 87Unit 5 New Energy and Climate / 93Text A Artifi cial Photosynthesis—the Potentially CleanestTechnology / 94Text B Turn CO2 into Valuable Products / 102Text C Th e Disruptive Power of the Renewables / 109Unit 6 Social Networking / 113Text A Why WhatsApp Only Needs 50 Engineers for Its900M Users / 114Text B Social Media and the Big Data Explosion / 122Text C Advantages and Disadvantages of Social Networking / 130Unit 7 Space Exploration / 135Text A Leaders Satellites Space: the Next Startup Frontier / 136Text B Searching for Aliens: the Wow Factor / 144Text C China’s Commercial Aerospace Dream EdgesCloser to Reality / 152Unit 8 Medical Science / 157Text A FDA Approval Brings First Gene Th erapy to theUnited States / 158Text B Aft er Surgery in the Womb, a Baby Is Kicking up Hope / 169Text C Current Alzheimer’s Treatments / 177