Onaja Waki (left) is about to start college in California, but she and her mother, Oneida Cordova, have been talking openly for years about the dangers of sexual assault. Teresa Chin/Youth Radio hide caption

itoggle caption Teresa Chin/Youth Radio

Lenox Mall, in the Buckhead neighborhood of Atlanta, used to be the site of a country home estate and is now a traditional indoor mall with two anchor stores. Madeline Veira/Youth Radio hide caption

itoggle caption Madeline Veira/Youth Radio

Frankie Soto is in charge of the "underground" rock shows at an empty storefront in Stockton's Normandy Village Shopping Center. Brett Myers/Youth Radio hide caption

itoggle caption Brett Myers/Youth Radio

Kids as young as 13 purchase e-cigarettes, or "vape pens," online, where independent sellers don't necessarily ask a buyer's age. Jenny Lei Bolario/Youth Radio hide caption

itoggle caption Jenny Lei Bolario/Youth Radio

Football practice at Castro Valley High School in California. Proper hitting technique requires players to keep their heads up to prevent neck injuries and concussions. Brett Myers/Youth Radio hide caption

itoggle caption Brett Myers/Youth Radio

A growing number of children are entering puberty at younger ages — sometimes as young as 6 or 7. But in many schools, sex education classes don't begin before the fifth grade. Cuneyt Hizal/iStockphoto.com hide caption

itoggle caption Cuneyt Hizal/iStockphoto.com