September 21, 2014; 4:41 AM ET
In keeping with tradition, temperatures will continue their up-and-down cycle during the second half of September around Philadelphia. more >
Noticeably cooler tomorrow
School hallways may not be the best place to ride out tornadoes, despite a long-standing tradition of ducking and covering along corridors.
Expert advice to help keep your on-campus nutrition on track.
Severe weather can strike quickly, and your family might not be together when it happens.
Newly discovered patterns in old outbreaks of childhood diseases, such as diphtheria and scarlet fever, could help modern disease fighters.