(That's a tenth of the width of a single human hair.) Bright-field image of a 10 μm elephant, printed inside a live HeLa cell. Credit: Mur et al/arXiv 2506.13232 ...

To make structures inside a cell, physicist Matjaž Humar and colleagues injected cells with photoresist. Then they 3-D printed the structures and let the remaining photoresist dissolve.

For a segment for the Inside Nature’s Giants television series several years ago, Dr. John Hutchinson of the Royal Veterinary College had the pleasure of documenting the dissection of an ...