(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 ...

Here’s what you’ll learn when you read this story: Scientists were able to 3D-print different microstructures inside live cells, including a delightfully tiny micro-elephant.