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 Children of Same-Sex Parents ............................................................................809 Hormonal Contraceptives for Males .....................................................................844 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 Traffi cking: 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 The Evolving View of Biological Sex ....................................................................804 The Impact of the Pill ........................................................................................841 Local and Global Health xiv