Pearl Nacre - More than just beauty

Fascinating article, Bernadette! The moon dwellings made me smile:

"The nacre might also be an ideal material to build houses on the moon and other planets: the only necessary "ingredients" would be an astronaut and a small tube of bacteria, Meyer says. "The moon has a large amount of calcium in the moon dust, so the calcium's already there. The astronaut brings the bacteria, and the astronaut makes the urea, which is the only other thing you need to start making calcium carbonate layers."
 
Interesting article. Although, it does bring up the possibility of synthetic cultured pearls.
 
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