Tobacco Use and Risky Behaviors ....................................................................... 374 Co-Occurring Disorders: Substance Use and Mental Health ................................... 411 Your Brain on Drugs .......................................................................................... 442 How Close Are Online Friendships? ..................................................................... 488 Do Violent Video Games Cause Violence? ............................................................. 519 Sexting and Mental Health ................................................................................. 590 Which Substances Are Carcinogens? ................................................................... 623 Combating Antibiotic Resistance ........................................................................ 666 Point-of-Care Testing and Diagnosis for STIs ........................................................ 679 Improving Diabetes Treatment ............................................................................ 723 In Vitro Fertilization (IVF) ................................................................................... 751 The Adolescent Brain ........................................................................................ 785 Perceptions and Norms: The Impact on Health ...................................................... 22 Challenges to Accessing Healthcare ...................................................................... 55 Culture Affects Communication ............................................................................ 74 Everyone Has a Cultural Identity ......................................................................... 116 Describing Happiness Around the World .............................................................. 146 Are Some Countries More Stressful Than Others? ................................................. 181 Perceptions of Mental Illnesses .......................................................................... 229 Undernutrition: A Global Problem ....................................................................... 268 The Thin Ideal Is Not Universal .......................................................................... 302 Physical Activity Around the World ...................................................................... 338 Rates of Tobacco Use Around the World .............................................................. 381 Consequences of Alcohol Use ............................................................................. 402 The Opioid Epidemic ......................................................................................... 435 Parents and Children Around the World ............................................................... 481 Human Trafficking: A Worldwide Issue ................................................................. 551 Extreme Weather and a Changing Climate ............................................................ 578 Water and Sanitation ......................................................................................... 612 The Unequal Burden of Communicable Disease ................................................... 652 Reducing HIV Transmission in Africa ................................................................... 692 Noncommunicable Diseases in Your Community and World ................................... 704 Cervical Cancer Screening .................................................................................. 746 What Does It Mean to Be an Adult? ..................................................................... 789 Local and Global Health xiv