Demodex mites live inside your pores. Just about every adult human alive has a population living on them, and they’re basically impossible to get rid of. Luckily, they’re harmless for most people.
Surgeons would love to find a replacement for surgical staples — one that doesn’t aggravate wounds on the way in and out. Bioengineers think they’ve found the right model — a porcupine’s quill.