United States March 14, 2018 10:55 pm Doreen Gentzler Opens 2018 Health & Fitness Expo Doreen Gentzler opens the 2018 NBC4 Telemundo 44 Health & Fitness Expo at the Washington Convention Center. Local 2:14 Opioid crisis: National drug take back day on Saturday 2:55 Concussion treatment: Returning to school and limiting screen time may help, study finds 2:39 What to know about ADHD medication and pregnancy 2:08 How to pick the best running shoes for outdoor exercise 3:41 Nail biting: A psychiatrist shares tips