Wildfire season in Arizona is a reminder of the dangers of smoke inhalation, a mixture of gases and fine particles from burning trees and other plant materials.

The U.S. Department of State Critical Language Scholarship Program is highly competitive with 630 students chosen from more than 5200 applicants this year.

In Miranda Loh’s lab, toenails are telling stories. They arrive in little brown envelopes almost every week, sometimes in batches of three or four, sometimes by themselves.