Microscopic Engineers

Certain bacteria can build their own magnetic compasses out of iron-sulfur crystals called greigite, enabling them to navigate in their environments. Remarkably, these bacteria can create complex crystal structures at normal temperatures—something human technology can't replicate. 

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Image: Magnetosomes in magnetospirillum gryphiswaldense, Frank Mickoleit, CC BY-SA 3.0, Wikimedia Commons.