Why do people have seasonal allergies?
754,205 views | Eleanor Nelsen • TED-Ed
Ah, spring. Grass growing, flowers blooming, trees budding. For those with allergies, though, this explosion of new life probably inspires more dread than joy. So what's behind this annual onslaught of mucus? Eleanor Nelsen explains what happens when your immune system goes rogue. [Directed by Lisa LaBracio, narrated by Addison Anderson, music by Weston Fonger].