. >> doctor vin gupta, msnbc medical contributor. >> ryan. >> walk us through.t we expect. >> to happen. >> and which senators. >> we should be watching. >> we're monitoring it right now on the senate finance committee, expected to gavel in at any moment. and that's when they'll begin the process of voting out the confirmation of robert f kennedy jr as the secretary of health and human services. the signal that we've gotten from almost every republican on the panel is that they're a yes vote. if every republican votes yes and every democrat votes no, he will move on to the next stage. that is why everyone is keeping such a close eye on senator bill cassidy of louisiana. cassidy raised serious concerns about robert f kennedy jr. s past statements on vaccines during both hearings. kennedy went through two hearings, one with the finance committee, one with the health, education, labor and pensions committee, of which cassidy is the chairman. and cassidy did not feel very satisfied with the way that kennedy answered some of those questions. cassidy took the weekend

i want to bring in msnbc medical contributor doctor vin gupta. walk us through this study.ly stands out to you? >> yeah. >> chris, you know, we're just beginning to understand the. >> health risks. >> of microplastics. basically very small. >> versions of plastic. >> that shed from bigger. >> plastics that you can see. >> with the human eye. >> like plastic. >> bags, tires, you name it. and this is concerning. >> you know, i think this. >> is like a. >> 1950s smoking. >> moment where back then we were just beginning to. >> understand the risks. >> of smoking. >> on the human body. this is we're going to look back 30 years and be like, wow, this is really quite something. >> we're just. >> understanding this. but this study looked at the fact that plastics are going. >> from our blood. >> microplastics into. >> brain tissue. >> and that's not normal. usually the arteries in. our brain are. >> actually really good at keeping things. >> in our. >> blood vessels, in. >> the blood vessels, not. >> diffusing into the brain tissue around them. so the fact that there's so much. >>