Food allergies come down to genetics, gut health, early exposure, and more. Here's what science says about why some immune systems misfire around food.
Limestone, shale, and basalt break down faster than most rocks. Here's why mineral composition, climate, and porosity determine how quickly different rocks weather.
Trouble swallowing, unexplained weight loss, and persistent heartburn can all point to esophageal cancer. Learn what symptoms to watch for and when to see a doctor.