this is cnn presents. tonight, we focus on stories related to your health department. tlets to the health of you and your family. it s a revolutionary treatment for depression that you re going to want to begin to know about. begin with an investigation into how school can make your child sick. the parents thought they hit the jackpot. their children won the lottery to get a coveted spot in one of new york s best public elementary schools. but they found out the school had a problem. it s not the teachers or the test scores or everyone the other kids. the problem is the building. it s toxic. that s right. it wasn t safe for the children. and ps-51 isn t alone. as part of dr. sanjay gupta s on going investigation, we found out all over the country, children are going to schools that can make them sick. his first stop was ps-51. yeah, i need your lunch bag. okay. marisol carera is helping her son, brandon, get ready for the first day of school. brandon seems excited.