Turns out the human body is a genuine provider of substances suitable for construction.
People have long ago come up with the idea of using organic matter to manufacture mortar mixes. Scientists from the University of Manchester in the UK have somewhat adapted this idea for use in alien conditions. It is no secret that one of the major problems of space exploration is the lack of building materials. The Martian terrain is of little use for this, and it is very expensive to deliver everything you need from Earth.
In this instance, you could take the missing materials directly from the bodies of colonisers. For example, blood is rich in serum albumin, which, according to scientists, makes quite endurable concrete out of lunar regolith and Martian soil. Other body fluids such as sweat, tears, and even urine might also be useful. Over a couple of years, just one coloniser could produce up to 500 kg of fitting material, which would be enough to construct an entire capsule room.
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