Now, researchers are finding we also share our microbes through our money. From tip jars to vending machines to the meter maid – each dollar, passed person to person, samples a bit of the environment it comes from, and passes those bits to the next person, the next place it goes.
The list of things found on our dollars includes DNA from our pets, traces of drugs, and bacteria and viruses that cause disease.
The findings demonstrate how money can silently record human activities, leaving behind so-called “molecular echoes.”
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