Video: Nearly half of all Americans unknowingly live with a chronic health condition such as diabetes or high blood pressure, according to a new study from the Centers for Disease Control and Prevention.
Video: Lisa Hymas of Grist explains why some environmentalists are suggesting that not everyone needs to have children -- and why our sheer numbers could be killing the planet.
Video: President Obama speaks about the innovations of modern-day land conservation and the importance of reconnecting American families to the outdoors.