How Do They Do Blood Tests?

Molly Bloom and Zoe from Lost PA dress Puerto Rico join us for Brains On. This week we're talking all about blood, the inspiration for this episode came from one of our listeners. How do they do blood tests? How do they know what's in there? That's a great question. So Zoe I'm wondering have you ever had to have your blood tested before? Yes I don't really like it but yeah so they've had to take blood like from your arm. Yeah I look away.