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But as the toxin spreads, stronger muscle groups become more rigid, leading to a frightening arching of the back.
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Nerve endings soak up this toxin, drawing it into the brain and spinal cord where it wreaks havoc on interneurons.
Our sense of smell is developing and exposure to toxins can make us cringe.
When the barrier had to be shut down for maintenance in 2009, toxin was added to 10km of this canal, to kill everything in it, just in case.
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