Hellooo, dear listener!
In this second part of this multi-part episode, I go on telling you the story of a group of smarty smart Italian researchers who, for the first time ever, finds man-made stuff, specifically microplastics, in human placentas.
In this episode you'll find how the scientists understand that what they found is actually plastics, what kind of plastics this things are precisely, and, above other things, how much plastic has been made - I mean ever - and how much plastic garbage ended up in the environment so far.
Aaand there's also a conspiracy theory about 1I/2017 U1 aka ʻOumuamua and some nanoprobes... 
Ciao!
Find the script (plus all the references & credits) here: https://www.sciencemug.com/2021/02/of-plastics-human-placenta-meet.html