The quill tip in this finger has microscopic, backward-facing barbs that make the quill hard to remove. Bioengineers think the same sort of barbs could help keep dissolvable medical staples in place until a wound heals.

The quill tip in this finger has microscopic, backward-facing barbs that make the quill hard to remove. Bioengineers think the same sort of barbs could help keep dissolvable medical staples in place until a wound heals.