Uh, so they've been experimenting with making concrete out of simulated Martian soil and they've discovered that the best compounds to turn it into really good concrete...
...are in blood, urine, sweat, and tears. In other words, the bodily fluids of astronauts might be used to provide the organic components necessary to make good concrete.
And yes, it does need that blood. Or rather, it needs a protein found in plasma called albumin.
You can't get blood from a stone, but you can apparently get stone from blood.
Assuming, of course, this doesn't result in health issues for the astronauts.
But yeah, blood, sweat and tears is usually a metaphor...
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