We have long known that we can catch germs while traveling. Recent years have shown that we can also bring home bed bugs. This holiday season, a PLoS One study informs us that by merely plopping into the seat of a car or airplane, we can unknowingly pick up dust mites—microscopic 8-legged arthropods that eat the dead parts of our bodies such as skin scales, dandruff flakes, and hair. Dust mites are eyeless, headless, and heartless, yet they’re expert travelers.