Researchers from the Leiden University just created the world's smallest boat using a 3D printer and it could easily sail down a human hair!
The aim of the researchers is to design potential vehicles that could travel inside the human body. This could help administer medical treatments, for instance.
The boat, which is just 30 micrometers in length, doesn't come without its details! It's got a cockpit and a chimney.
The design is part of a project to investigate microswimmers, which are essentially any small particles moving in fluids.