Hanyang University

The 3D printing of certain items could soon get a lot faster, simpler and more eco-friendly. That's because scientists have developed a new 3D printing ink which is easily extruded as a liquid, then solidifies on contact with a saltwater solution.

Here's something that you might not know about the humble cactus: it has tiny cracks in its skin, which allow it to store moisture. Now, scientists have applied that same principle to a membrane which could make fuel cells a more viable option for powering vehicles.​