Madeline Lillis still remembers the Cinderella Barbie doll she received for Christmas in 2005. Not just because it was the exact one she asked for, or because she never thought she’d actually get it — ...

The holiday season is supposed to be filled with joy, cozy sweaters, and the warm glow of twinkling lights. But for millions of people, December brings something less festive: worsening allergies, ...