Cities could be built on Mars - from shrimp shells, according to new research. A simple manufacturing technique using chitin - which gives molluscs and insects their strength - opens the door to developing colonies, say scientists.
The natural material forms the body armour of crustaceans, protects butterfly wings - and is also found in mushrooms. It's one of the most widespread organic polymers on Earth.
The scales of fish and amphibians are made from it. Dr Javier Fernandez, of Singapore University of Technology and Design, says it holds the key to "our transformation into an interplanetary species." The biodegradable product is already offering hope as an eco-friendly alternative to plastics on Earth.
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