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  1. Porcupine Quills Reveal Their Prickly Secrets - Science | AAAS

  2. Porcupine - Wikipedia

  3. Porcupine Barbs For Better Wound Healing - NPR

  4. More Than Sharp: The Science of Porcupine Quills

  5. Inspiration from a porcupine’s quills - MIT News

  6. Porcupine Barbs For Better Wound Healing - Colorado Public …

  7. Could Porcupine Quills Help Us Design the Next Hypodermic Needle?

  8. Porcupine Quills Inspire Better Needles | Science News

  9. Porcupine Quills Inspire Better Needles - Scientific American