"Scientific American sixty seconds science. I'm any Snead, plastic is lightweight knowledgeable, durable. But it also become so widespread that it's ending up in a lot of unwanted places including our own bodies. That's according to a new study, which found that humans are consuming shocking amount of so-called, micro-plastics micro-plastics kinda current working definition is plastic less than five millimeters. So people commonly quite that to something like a grain of rice, or assessments seed and down in terms of size class. I will say that most micro-plastics if people are interacting with our quite a bit smaller than the sesame seeds size which, I think always kinda shocked people when we start talking about the numbers because they kinda can't, you know, they can't see a lot of these things at least with the naked eye, Karen, Cox apiece, g candidate marine biology at the university of Victoria in Canada. One of the authors of the study, which is in the journal environmental science and technology micro-plastics come from numerous sources they can shed from larger plastics, or they may have been designed small to begin with further study, Cox and his team pulled together past scientific literature that calculated the number of micro-plastics in things we commonly consume such as tap and bottled water sugars seafood. Even in the air that we breathe, this analysis, help them figure out the baseline amount of micro-plastics that people are consuming every year. They couldn't include common foods like beef, poultry vegetables, in dairy in their analysis because data on them doesn't exist yet. In fact, their study could only account for fifteen percent of people's caloric intake, even missing the majority of what people swallow the research, revealed that at the very least humans appeared consume somewhere between seventy four thousand one hundred twenty one. Thousand micro classic particles every year, that number goes up for people drinking bottled water rather than tap water. Now is all this plastic safe to ingest? Scientists simply don't know, yet kind of the first estimate of dose, you could say rights with your thinking, in terms of toxicology Eco-Toxicology dose is very important factor to think about. And so this kind of presents the first estimate, but it is very much a underestimate, because of what we don't know. Thanks for listening for scientific American, sixty seconds science, I'm Anne Sneed."