News in Brief A New Study Reveals Diesel Filters’ Unintended Effects The study shows that the chemical reaction used in diesel filters can increase the presence of nitrogen dioxide—and worsen common allergic reactions. Leah Dunlevy
Social Justice The Curious Connection Between Allergies and Parasites Proteins in pollen and other allergens show up in tapeworms and mites, suggesting that allergies emerged as we evolved to fight parasite infections. Nathan Collins
Environment Our Warm Embrace of Those Allergic to Peanuts The rise in peanut allergies has inspired something rarely seen in the contentious world of food choice: cooperation. James McWilliams