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This is Scientific American 60-second science. I'm Annie Sneed.

Plastic is lightweight, malleable, durable, but it has 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 a shocking amount of so-called

microplastics. Microplastics, the kind of current working definition, is plastic less than

five millimeters. So people commonly equate that to something like a grain of rice or a sesame

seed and down in terms of size class.

I will say that most of the microplastics that people are interacting with are quite a bit

smaller than the sesame seed size, which I think always kind of shocks people when we start

talking about the numbers because they kind of can't, you know, they can't see a lot of these

things, at least with the naked eye.

Karen Cox, a PhD candidate in marine biology at the University of Victoria in Canada,

and one of the authors of the study, which is in the journal Environmental Science and Technology.

Microplastics come from numerous sources.

They can be 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

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