How Blood Works

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It’s red, it flows through your veins, the sight of it makes some people feel faint… but how exactly does blood work?

This short video crams a lot of science into an incredibly detailed five minutes, which careers through everything from EPO doping to the complexities of your immune system, as well as, umm, how to get it out of your clothes. It’s super-interesting stuff. [The Medicine Journal via Today I Found Out]