When Bacillus subtilis bacteria, a species normally found in the human gut, are placed in a drop of water, the organisms create a vortex, with bacteria on the outside swimming in one direction and the ones on the inside swimming the opposite way.
When Bacillus subtilis bacteria, a species normally found in the human gut, are placed in a drop of water, the organisms create a vortex, with bacteria on the outside swimming in one direction and the ones on the inside swimming the opposite way.
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