From man-made toxic chemicals such as industrial by-products to poisons that occur naturally, a water or food supply can be easily contaminated. And for every level of toxic material ingested, there is some level of bodily response, ranging from minor illness to painful certain death. Biosensors have long been used to safeguard against exposure to toxic chemicals. Food tasters employed by the ancients acted as early versions of biosensors, determining if a meal had been poisoned...
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